Systems quantum spin liquid phases. Medical search. Frequent questions

He is one of the recipients of the 2016 EPS Europhysics Prize in condensed matter physics for theoretical studies on magnetic skyrmion phases in MnSi, a new phase of matter. (wikipedia.org)
Finding new phases of matter is a problem of fundamental importance in condensed matter physics. (arxiv-vanity.com)
Condensed matter physics is a fascinating field that explores the physical properties of solids and liquids. (freescience.info)
Landau theory is a cornerstone in condensed matter physics, providing insights into phase transitions. (freescience.info)
The central source of intellectual vitality and practical importance of condensed matter physics is the richness and diversity of behaviors exhibited by strongly interacting systems with many degrees of freedom, ranging from the collective behavior of neurons in the brain to the collective condensation of Cooper pairs that produce the macroscopic quantum phenomena associated with superconducting order. (stanford.edu)
The collective motion of the electrons follows the laws of quantum mechanics and is one of the most challenging problems in condensed matter physics. (tohoku.ac.jp)
Meeting ID: 954 7380 2970 Passcode: 654044The search for quantum spin liquids is one of the most hotly pursued endeavors in condensed matter physics. (kfki.hu)
The spin ice compounds Dy 2 Ti 2 O 7 and Ho 2 Ti 2 O 7 are highly unusual magnets which epitomize a set of concepts of great interest in modern condensed matter physics: their low-energy physics exhibits an emergent gauge field and their excitations are magnetic monopoles which arise from the fractionalization of the microscopic magnetic spin degrees of freedom. (mpg.de)

Dr. Melko's research interests involve strongly-correlated many-body systems, with a focus on emergent phenomena, ground state phases, phase transitions, quantum criticality, and entanglement. (uwaterloo.ca)
Does undiscovered and novel universal behavior exist at certain phase transitions? (uwaterloo.ca)
Phase transitions are fascinating because they give us a window into "universal" phenomena - quantitative connections that occur between very disparate natural systems, in condensed matter and beyond. (uwaterloo.ca)
This field of study seeks to unravel the secrets behind fascinating phenomena like magnetism, superconductivity , phase transitions, and Einstein condensate. (freescience.info)
Phase transitions occur when a material undergoes a change in its physical state, such as from solid to liquid or from magnetic to non-magnetic. (freescience.info)
Landau theory describes these transitions by considering the order parameter, which characterizes the change in symmetry at different phases. (freescience.info)
Pure quantum systems can undergo phase transitions analogous to the classical phase transition between the liquid and gaseous states of water. (fapesp.br)
At the quantum level, however, the particle spins in states that emerge from phase transitions display collective… Click here to view the original article. (fapesp.br)
131, 060404 (2023)], we explore features of scale invariant dynamics of survival probability and SFF at criticality, i.e., at eigenstate transitions from quantum chaos to localization. (arxiv.org)
I study topics related to quantum phase transitions, superconductivity, and nanotechnology. (usc.edu)
Recently, we have applied the stochastic series expansion algorithm to study field induced phase transitions in quantum spin liquids, developed optimization algorithms to construct nano-scale opto-electronic devices, and generalized the BCS (Bardeen-Cooper-Schrieffer) theory to investigate the consequences of unconventional superconductivity in strongly correlated materials. (usc.edu)
3) Neutron scattering Bragg peak intensity is proportional to the ordered moment S squared multiplied by the ordered volume fraction V M . MuSR can provide independent information on the local ordered moment size and V M . This feature helps detection of phase separation and first order magnetic transitions. (mrs.org)
Through this work, the researchers revealed that there are successive transitions from the quantum spin liquid state if a magnetic field is applied in a special direction along which kagome-lattice layers and triangular-lattice layers are stacked one on top of the other. (nanowerk.com)
In resistivity, the non-Fermi liquid persists up to around 0.4-0.5 GPa and crosses over or transitions to a Fermi liquid 4, 6, 15 , as theoretically suggested 16 . (researchsquare.com)
My main interest is the study of systems where these correlations are very strong or close to phase transitions, with particular attention to the collective, many-particle excitations of the system: compressibility, magnetic susceptibility, dielectric function, charge-density waves, etc. (lu.se)

Quantum systems with many interacting degrees of freedom like electrons show a rich array of emergent behaviour like magnetism, superconductivity. (icts.res.in)
1990 Vordiplom Physics: Technical University of Berlin 1995 PhD Physics: Florida State University 1998 - present: faculty member at the University of Southern California My research group is interested in topics related to quantum magnetism, superconductivity, and nanotechnology. (usc.edu)
My group is interested in topics related to quantum magnetism, superconductivity, and nanotechnology. (usc.edu)
Promising and currently the only candidate of the doped spin liquid is a triangular-lattice organic conductor, κ-(BEDT-TTF)4Hg2.89Br8, recently found to hold metallicity, spin-liquid-like magnetism and BEC-like superconductivity4-6. (researchsquare.com)
More specifically, we are interested in unconventional and topological superconductivity, complex phase diagrams, the impact of impurities in crystals, spin-orbit coupling, magnetism, spin liquids and topological order, moiré superlattice systems, and non-Hermitian many-body physics. (uibk.ac.at)

These techniques can also be combined into a spectroscopic tool to detect the low-energy collective excitations in the electron system that promote the spin transfer. (nature.com)
A variety of magnetic compounds have been regarded as the 1D antiferromagnetic (AF) Heisenberg chain model [ 3 - 9 ], whose ground state resides in a Tomonaga-Luttinger liquid (TLL) characterized by spinon quasiparticles with gapless elementary excitations [ 10 , 11 ]. (frontiersin.org)
The wide applicability of RIXS and its accessibility to charge, spin, and orbital excitations allow the direct measurement of dispersion relation of elementary excitations in a large family of quantum materials. (tohoku.ac.jp)
The emergent elementary excitations are often analogous to elementary particles in high-energy physics and open possibilities for future applications such as topological quantum computing. (tohoku.ac.jp)
We show theoretically that at low temperatures Γ_{B} is sensitive to crossings in the lowest excitations within gapped phases, and identify the measured shoulderlike anomaly as being of such origin. (bvsalud.org)
When an unknown magnetic material is synthesized, it would be most sensible to perform MuSR first, followed by more detailed studies of spin structures and spin excitations by neutron scattering. (mrs.org)
Our paper exploring the field dependence of the spin excitations and the formation of static order in NaYbO2 was published today in Phys. (ucsb.edu)
We observe the characteristic magnetic field dependence of the gap as expected for fractionalized spin-1/2 spinon excitations. (elsevierpure.com)
We find, in contrast to the square lattice, that there is a truly short ranged resonating valence bond (RVB) phase with no gapless collective excitations and with deconfined, gapped, spinons for a finite range of parameters. (mpg.de)
If in simple metals, this interaction is the lattice deformation (phonon), other kind of excitations, like magnon, valence fluctuations, are proposed to be the glue of the formation of the Cooper pairs in quantum materials. (cnrs.fr)
This field has matured later on in the study of the fractional quantum Hall effect [1], which continues to deliver exciting physics, in the form of non-abelian excitations and the observation of neutral edge modes [2]. (cecam.org)

Quantum mechanics helps comprehend phenomena such as superconductivity or quantum tunneling, vital for advanced technologies like computer chips and quantum computers. (freescience.info)
This work is motivated by and connected to recent experiments in the fields of quantum antiferromagnetism, high-temperature and heavy-fermion superconductivity, and nano-photonics. (usc.edu)
Here, we report the thermoelectric signature that mobile holes in the spin liquid background is in a quantum critical state and it pertains to the BEC-like superconductivity. (researchsquare.com)
Among them, quantum criticality has long been a focus of profound interest since strange metal, unconventional superconductivity and magnetic quantum phase transition all spring from a single point called a quantum critical point as extensively discussed in heavy electron systems and copper oxides 7, 8 . (researchsquare.com)
Here, we report our observation of the thermoelectric signature of quantum criticality in the doped QSL phase and its possible relevance to superconductivity. (researchsquare.com)

In particular, his most important contributions have been in deconfined quantum criticality (with T. Senthil, Matthew P. A. Fisher, Subir Sachdev and Leon Balents), Dirac and Weyl semimetals, iron-based high-temperature superconductors, magnetic skyrmion phases, and topological insulators where, in particular and more recently, he has explored several aspects and field theories of symmetry protected topological phases and Floquet topological phases. (wikipedia.org)
A transverse field induces an Ising QPT with gapless quantum criticality and self-duality of QCP [ 15 ]. (frontiersin.org)
In fact, due to that the absolute zero temperature cannot be attained experimentally, the field-induced quantum criticality has been intensively investigated by using the field dependence of magnetization measurement to determine the kink at finite temperature [ 3 , 6 , 9 , 13 , 16 ], which becomes rounded such that the QCP cannot be measured exactly. (frontiersin.org)
We show that, in contrast to the quantum chaotic regime, the quantum dynamics at criticality do not only exhibit scale invariance at late times, but also at much shorter times that we refer to as mid-time dynamics. (arxiv.org)
The Seebeck coefficient divided by temperature, S/T, is enhanced on cooling with logarithmic divergence indicative of quantum criticality. (researchsquare.com)
The present results reveal that the quantum criticality in a doped spin liquid emerges in a phase, not at a point, and is involved in the unconventional BEC-like nature. (researchsquare.com)
The quantum criticality in a phase instead of at a point and its possible relevance to QSL is an issue of profound significance. (researchsquare.com)
The present work aims to verify the quantum critical nature of the electronic state in κ-HgBr with pressure variation through thermoelectric effect which is very susceptible to quantum criticality, exploiting highly compressible feature of organic crystal 17 . (researchsquare.com)

A quantum spin liquid relies on an intrinsic property of the electrons in the material, the so-called spin. (ist.ac.at)
Achieving a similar level of control over the spin degrees of freedom, either from electrons or nuclei, could provide intriguing prospects for both information processing and the study of fundamental solid-state physics issues. (nature.com)
Here we report procedures that carry out the controlled transfer of spin angular momentum between electrons-confined to two dimensions and subjected to a perpendicular magnetic field-and the nuclei of the host semiconductor, using gate voltages only. (nature.com)
These studies give a glimpse of a strange quantum world where exotic particles such as spin-charge separated electrons can be identified through universal signatures relevant for simulation, theory, or eventually, experiment. (uwaterloo.ca)
Using numerical simulations, the group showed how a magnetic field could be used to control the properties of north and south poles, which are fractionalized from magnetic moments of electrons, on a frustrated magnet called a quantum spin ice. (nanowerk.com)
This system includes a quantum spin liquid state where spins-the property of electrons that lead to magnetic properties-are prevented from ordering and freezing by zero-point motion, a type of motion allowed even at zero temperature under quantum mechanics, of their monopoles. (nanowerk.com)
The Berry phase reflects the quantum mechanical nature of the charge-carrying electrons in metals and is influenced by magnetic order. (nanowerk.com)
Notably, a recent study of a heavy electron compound with a Kagome lattice, CePdAl, have found a quantum critical phase residing in a range of parameter space, not at a point, suggesting that a non-Fermi liquid phase is stabilised along with a quantum spin liquid (QSL) of f electrons 9 . (researchsquare.com)
We study one-dimensional Kondo Lattices (KL) which consist of itinerant electrons interacting with Kondo impurities (KI) - localized quantum magnetic moments. (osti.gov)
They range from commensurate insulators (at filling factors 1/2, 1/4 and 3/4) to metals with strongly interacting conduction electrons (close to these three special cases) to an exotic phase of a helical metal. (osti.gov)
article{osti_1559123, title = {Physics of Arbitrarily Doped Kondo Lattices: from a Commensurate Insulator to a Heavy Luttinger Liquid and a Protected Helical Metal}, author = {Tsvelik, Alexei M. and Yevtushenko, O. M.}, abstractNote = {We study one-dimensional Kondo Lattices (KL) which consist of itinerant electrons interacting with Kondo impurities (KI) - localized quantum magnetic moments. (osti.gov)
85Rb), arising from the interaction of the magnetic field created by the orbiting electrons and the magnetic moment due to the nuclear spin. (lu.se)

We show that this XYZ model exhibit two distinct symmetry enriched QSI phases, that we dub dipolar QSI and octupolar QSI. (utoronto.ca)
Hao Shi, Carlos A. Jimenez-Hoyos, R. Rodriguez-Guzman, Gustavo E. Scuseria, and Shi- wei Zhang, "Symmetry-projected Wave Functions in Quantum Monte Carlo Calculations," Phys. (wm.edu)
More particularly, the interest is in unconventional quantum magnets called quantum spin liquids, interacting symmetry protected topological phases, correlated metals and interplay of spin-orbit coupling and electron correlations in such systems. (icts.res.in)
The feature of these systems is that each pair of bands related by pseudo-time-reversal symmetry carries a Z2 topological invariant. (mpg.de)
dQSI and oQSI are two distinct symmetry enriched U ( 1 ) quantum spin liquids, with space group symmetry playing the crucial role. (arxiv-vanity.com)
Symmetry refers to patterns or transformations that leave a system unchanged, while topology deals with the study of geometric properties that remain invariant under continuous deformations. (freescience.info)
Aiming to reach the same phenomenology in spin-like systems, we propose a family of SU($N$)-symmetric models in the fundamental representation, on the square lattice with short-range interactions restricted to triangular units, a natural generalization for arbitrary $N$ of an SU($3$) model studied previously where time-reversal symmetry is broken explicitly. (arxiv.org)
Initially introduced by Li & Haldane in the context of the fractional quantum Hall effect, its usefulness has been shown to extend to many more fields, such as topological insulators, fractional Chern insulators, spin liquids, continuous symmetry breaking states, etc. (uni-koeln.de)

Quantum spin liquid (QSL) is an exotic phase of matter and provides an interesting example of emergent non-locality. (utoronto.ca)
The peculiar interplay between spin-orbit effects, electron-electron interaction, and lattice produces an elaborate phase diagram for the 4d 5 transition metal layered compound α-RuCl 3 , which could host novel exotic quantum phases, such as a room temperature quantum spin Hall effect and Kitaev quantum spin liquid (QSL) behavior. (ornl.gov)
Some of these quantum critical points are relatively conventional, while others involve exotic phenomena such as fractionalized particles or emergent gauge symmetries. (uwaterloo.ca)
These support such exotic phenomena as fractional charges, spin-charge separation, and topological order - a crucial ingredient in modern proposals to build a quantum computer from topologically protected qbits. (uwaterloo.ca)
The solid state systems hosting these exotic phases, termed as "Quantum Materials", have enlarged their scope with the aid of advances in growing high-quality single crystals and in fabricating their functional devices. (tohoku.ac.jp)
In two dimensions, corner-sharing triangular geometries such as the kagome lattice have proved to be a fertile ground in realizing these exotic phases of quantum matter. (kfki.hu)
Here we show that magnetic monopoles do emerge in a class of exotic magnets known collectively as spin ice: the dipole moment of the underlying electronic degrees of freedom fractionalises into monopoles. (mpg.de)

Usually when many interacting particle systems are taken out of equilibrium by driving them locally, globally or through boundaries, in low dimensions they manifests themselves through various interesting phenomena like anomalous tagged particle diffusion, appearance of long range correlations (both static and dynamic), anomalous transport, nonlinear and singular temperature profiles etc. (icts.res.in)
This search motivates in part the exploration of new classes of materials, where novel parameter regimes can lead to phases not realized elsewhere, and other new phenomena. (arxiv-vanity.com)
During the action the research fellow has investigated various aspect of Rydberg dressing scheme in many-body systems and non-equilibrium quantum phenomena in a disordered system. (europa.eu)
Can quantum systems, and all of their hosts of intriguing phenomena, be studied with classical computers? (uwaterloo.ca)
Up to now, probing the quantum phase transition (QPT) and quantum critical (QC) phenomena at finite temperatures in one-dimensional (1D) spin systems still lacks an in-depth understanding. (frontiersin.org)
In this regard, one-dimensional (1D) quantum spin systems offer field tunability for probing QPT and critical phenomena. (frontiersin.org)
Dramatic new physical phenomena are being realized by combining this field of TIs with the subfield of spin-based electronics known as spintronics. (nanowerk.com)
Our group deals with the theoretical description of the emergent collective phenomena that arise in interacting condensed matter systems as a result of competing interactions, disorder, and topology. (uibk.ac.at)
I did my PhD with Professor Katsnelson at Radboud University (2013-2018, thesis Collective phenomena in strongly correlated systems ). (lu.se)

Recent discovery of a large number of materials including high temperature superconductors, various frustrated magnets, fractional quantum Hall systems and topological band insulators seem to indicate the existence of a whole new class of condensed matter phases whose properties cannot be captured within the conventional paradigm of condensed matter theory. (icts.res.in)
In this talk, I will talk about a class of magnonic systems that are the natural counterparts of time-reversal symmetric topological insulators in two and three dimensions [1,2]. (mpg.de)

He has also done important works on quantum magnetic systems and quantum entanglement properties of spin liquids and related topological orders. (wikipedia.org)
The group is interested in using these methods for understanding systems such as light-matter hybrid systems, cavity-QED and circuit-QED systems, and look at fundamental aspects (such entanglement, transport, fluctuations) as well as potential device applications. (icts.res.in)
Present research suggests that a proper understanding of these new phases would have to take into account the the subtle interplay of symmetries and quantum entanglement. (icts.res.in)
Spin-orbital entanglement can lead to rather complicated models, but this need not always be the case. (arxiv-vanity.com)
Entanglement is a quintessential feature defining quantum physics. (uwaterloo.ca)
In most condensed-matter systems, entanglement between two regions of a multi-particle system scales as the boundary (or area) between them. (uwaterloo.ca)
Extensive ED on small (periodic and open) clusters up to $N=10$ and an innovative SU($N$)-symmetric version of iDMRG to compute entanglement spectra on (infinitely-long) cylinders in all topological sectors provide unambiguous signatures of the SU($N$)$_1$ character of the chiral liquids. (arxiv.org)
The entanglement spectrum, i.e. the logarithm of the eigenvalues of reduced density matrices of quantum many body wave functions, has been the focus of a rapidly expanding research endeavor recently. (uni-koeln.de)
After a general introduction to the field we review some of our own contributions to the field, in particular the perturbative structure of the entanglement spectrum in gapped phases, the entanglement spectrum across the Mott-insulator transition in the Bose-Hubbard model, and the relation of the entanglement spectrum of (1+1) dimensional quantum critical systems to the operator content of their underlying CFT. (uni-koeln.de)
The newly discovered two-dimensional (2D) topological spin liquids [9,10], some being close analogs of the FQHE, some providing completely new classes of exciting materials, are all charaterized by long-range entanglement. (cecam.org)

Quantum spin ice (QSI) is a physical realization of U(1) QSLs on the pyrochlore lattice. (utoronto.ca)
We consider a class of electron systems in which dipolar-octupolar Kramers doublets arise on the pyrochlore lattice. (utoronto.ca)
Using a new computational method, an international collaboration has succeeded for the first time in systematically investigating magnetic quantum effects in the well-known 3-D pyrochlore Heisenberg model. (phys.org)
One of the leading models for studying 3-D frustrated quantum magnets is the Heisenberg model on a pyrochlore lattice-a simple cubic crystal structure (see illustration). (phys.org)
Yasir Iqbal et al, Quantum and Classical Phases of the Pyrochlore Heisenberg Model with Competing Interactions, Physical Review X (2019). (phys.org)
Nanowerk News ) In work published in Physical Review Letters ( 'Quantum spin ice under a [111] magnetic field: from pyrochlore to kagomé' ), scientists from RIKEN in Japan have discovered interesting new magnetic properties of a type of materials known as "quantum spin ice. (nanowerk.com)
A particularly simple proposition pertains to spin ice on the highly frustrated pyrochlore lattice. (mpg.de)
We study the ground-state and low-energy properties of classical vector spin models with nearest-neighbour antiferromagnetic interactions on a class of geometrically frustrated lattices which includes the kagome and pyrochlore lattices. (mpg.de)
We study the precessional spin dynamics of the Heisenberg pyrochlore antiferromagnet. (mpg.de)

Near the QCP, a QC regime emerges at finite temperatures in an extended parameter space attributed to the interplay between quantum and thermal fluctuations [ 2 ]. (frontiersin.org)
We find that this unconventional phase transition originates from the interplay between exceptional lines and van Hove singularity, which has no counterpart in equilibrium. (arxiv.org)
Quantum materials are a wide category of materials whose properties are largely determined by the interplay of different electronic degrees of freedom charge, spin, orbital and lattice. (cnrs.fr)
Recent findings have highlighted the intricate interplay between viral infection, the host immune system and the bone remodelling process. (bvsalud.org)

These materials demonstrate interesting properties as they behave as "frustrated magnets"-systems that can settle into various magnetic states because of their special geometry. (nanowerk.com)

In this connection, it is notable that the organic conductor, κ-(BEDT-TTF) 4 Hg 2.89 Br 8 (abbreviated as κ-HgBr) is suggested to be a doped QSL that hosts a non-Fermi liquid phase in a finite pressure range. (researchsquare.com)
Remarkably, κ-HgBr shows non-Fermi liquidity and spin susceptibility well scaled to that of the spin liquid material, κ-(BEDT-TTF) 2 Cu 2 (CN) 3 , thus suggesting that κ-HgBr hosts a doped QSL 5 . (researchsquare.com)
Several electronic instabilities, charge density wave, pseudo gap phase, are observed with strong deviations to the Fermi liquid behaviour. (cnrs.fr)

Furthermore, coherence in the dressed system is recently observed by collapse and revival dynamics. (europa.eu)
Thus, our results provide a guide to the development of MBL theory or new tools for simulating complex quantum dynamics. (europa.eu)
Summary: We observe a coherent collapse and revival dynamics in the long-range interacting system. (europa.eu)
The notion of scale invariant dynamics is well established at late times in quantum chaotic systems, as illustrated by the emergence of a ramp in the spectral form factor (SFF). (arxiv.org)
We further explore the crystal field Hamiltonian as well as the spin dynamics of the field-induced ordered state in this material. (ucsb.edu)
We study the quantum dimer model on the triangular lattice, which is expected to describe the singlet dynamics of frustrated Heisenberg models in phases where valence bond configurations dominate their physics. (mpg.de)
In this review, we provide an elementary introduction to these concepts and we survey the thermodynamics, statics and dynamics - in and out of equilibrium - of spin ice from these vantage points. (mpg.de)
Dynamics at the protein-water interface from 17 O spin relaxation in deeply supercooled solutions. (lu.se)
Dynamics of anisotropic colloidal systems: What to choose, DLS, DDM or XPCS? (lu.se)

This intriguing region is featured by the absence of energy scales other than temperature as well as the corresponding critical properties of quantum correlations or thermodynamic quantities, which culminate into scaling characteristic and universality [ 3 - 6 ]. (frontiersin.org)
form highly frustrated lattices of molecular dimers in which strong correlations give rise to Mott insulating states situated close to the metal-to-insulator phase boundary. (mdpi.com)
We pursue an alternative strategy, namely that of realising them not as elementary but rather as emergent particles, i.e., as manifestations of the correlations present in a strongly interacting many-body system. (mpg.de)
Longitudinal relaxation in dipole-coupled homonuclear three-spin systems: Distinct correlations and odd spectral densities. (lu.se)

We establish the presence of a quantum paramagnetic ground state and investigate its nature, by classifying symmetric and chiral quantum spin liquids, and inspecting their instabilities towards competing valence-bond-crystal (VBC) orders. (kfki.hu)

This XYZ model is absent from the notorious sign problem for a quantum Monte Carlo simmulation in a large parameter space. (utoronto.ca)
Dr. Melko's work has employed Monte Carlo simulations and Density Matrix Renormalization Group methods to explore the low-temperature physics of classical and quantum magnetic materials, cold atoms in optical lattices, bosonic fluids and low-dimensional systems. (uwaterloo.ca)
His favourite tool for research is simulation, particularly classical and quantum Monte Carlo, Density Matrix Renormalization Group methods, and numerical series expansion methods. (uwaterloo.ca)
Well, round here you never know - they might be - and despite the rain, almost a hundred years later, forty-six people have gathered in Vallico Sotto to attend the ninth "Quantum Monte Carlo in the Apuan Alps" international workshop. (vallico.net)
From the 26th of July to the 2nd of August 2014 our resident physicists and chemists spent each morning listening to talks on quantum Monte Carlo and related computational electronic structure methods, followed by afternoons that were often full of mountain walking, caving, canyoning and other activities but - for pretty much the first time ever in history of events at TTI - were equally often cancelled because of the appalling weather. (vallico.net)
I think it's now clear to most people that the quantum Monte Carlo method is continuing to grow in utility and importance, and for those with a big enough computer it self-evidently ought to be the method of choice for highly accurate benchmark quantum-mechanical calculations of molecules and materials - certainly those with more than a few atoms. (vallico.net)
Quantum Monte Carlo in the Apuan Alps may return one day, but financial issues and the increasingly stupid organizational effort required means that summer 2015 will mark our first proper year off. (vallico.net)
We investigate microscopic models of interacting electronic systems, and use numerical techniques, such as Quantum Monte Carlo, Renormalization Group and Exact Diagonalization, to find their phase diagrams, ground state properties, and excitation spectra. (usc.edu)
My research group investigates microscopic models of interacting electronic systems, using numerical techniques such as Quantum Monte Carlo, to understand their phase diagrams, thermodynamic properties, and excitation spectra. (usc.edu)
Towards understanding the rich quantum phase diagram of the square-kagome lattice, we employ state-of-the-art quantum many-body numerical techniques such as variational Monte Carlo (VMC) with versatile Gutzwiller-projected Jastrow wave functions, unconstrained multi-variable variational Monte Carlo (mVMC), and pseudo-fermion/Majorana functional renormalization group (PF/PM-FRG) methods. (kfki.hu)

Applications of the formalism have been made towards understanding transport in quasi-periodic systems such as the Aubry-Andre-Harper model which is a simple one-dimensional system with a rich non-equilibrium phase diagram. (icts.res.in)
The quantum phase diagram is renormalized by the anisotropy (∆), which manifests a quantum critical point (QCP) h c = 1 + ∆ signaling the transition from gapless Tomonaga-Luttinger liquid (TLL) to gapped ferromagnetic (FM) state, demonstrated by the magnetic entropy and thermal Drude weight. (frontiersin.org)
Temperature-pressure phase diagram of the Kitaev hyperhoneycomb iridate ß-Li_{2}IrO_{3} is explored using magnetization, thermal expansion, magnetostriction, and muon spin rotation measurements, as well as single-crystal x-ray diffraction under pressure and ab initio calculations. (bvsalud.org)
This paper showed that the Ce moments form a long-range ordered Neel state below ~6K, and suggest that this system presents an example of a material with a substantial J1/J2 ratio on the Heisenberg J1-J2 phase diagram on a distorted diamond lattice. (ucsb.edu)
The schematic phase diagram is shown in Fig. 1c. (researchsquare.com)

The work published deepens our understanding of solids and contributes to the systematic advancement of the search for 3-D spin fluids in quantum materials. (phys.org)
From investigating cold atoms to Einstein condensates, condensed matter physicists explore the fascinating realm of quantum field theory and superconducting solids. (freescience.info)

There is research on developing a microscopic theory of electric and heat transport and in understanding noise and fluctuations in open quantum systems, These research areas involve basic and fundamental problems in theoretical physics and at the same time are of great current interest because they are directly relevant for understanding experiments at the micro- and nano- scales. (icts.res.in)
Calogero model and its various generalizations and the Toda system) both from microscopic and collective field theory point of view. (icts.res.in)
SOC entangles the spin and orbital degrees of freedom, and microscopic models including SOC have in many cases not yet been constructed and studied. (arxiv-vanity.com)
In this letter, we study a class of systems where strong SOC leads to surprisingly simple microscopic models that - in different limits - naturally realize not only a topological band insulator, but also two distinct quantum spin ice (QSI) phases. (arxiv-vanity.com)
He is particularly involved in studying microscopic models that display interesting quantum behavior in the bulk, such as superconducting, spin liquid, topological, superfluid or supersolid phases. (uwaterloo.ca)
Frustration is the inability of a system to simultaneously satisfy all of its individual microscopic constraints. (uwaterloo.ca)
This is supported by muon spin relaxation measurements down to 0.1 K, which provide microscopic evidence for a broad distribution of internal magnetic fields. (bvsalud.org)

A striking anisotropy was observed in the charge distribution along the Ru-Cl-Ru hopping paths, indicating that the bond-dependent behavior in this system may appear at temperatures considerably higher than the estimated strength of the Kitaev coupling. (ornl.gov)
This means that the actions of each spin determine the behavior of its neighbors. (ist.ac.at)
Although such critical behavior is for the large part understood in classical physical systems, quantum mechanical systems offer a variety of possibilities for new manifestations of universal behavior. (uwaterloo.ca)
In classical systems, this leads to interesting collective behavior at low temperatures, such as seen in the famous examples of "spin ice" materials. (uwaterloo.ca)
Quantum behavior experiment flawed? (phys.org)
The latter was observed through the so-called Berry phase corrections to electronic behavior, where they saw the largest such response reported to date in this type of magnet, which is known as an antiferromagnet. (nanowerk.com)
These experiments provided the ability to map the behavior of the magnetic gadolinium spins to precisely know their orientation and response to temperature and magnetic field. (nanowerk.com)

Figure 1: Ferromagnetic phase transition with easy-axis anisotropy between the spin-unpolarized and fully spin-polarized 2/3 fractional quantum Hall states. (nature.com)
Figure 4: Time progression of the ferromagnetic phase transition. (nature.com)
Figure 7: Current-induced displacement of the ferromagnetic phase transition. (nature.com)
1) The observation MBL phase transition in two-dimensions 2) Evidence of diverging length scale near the critical disorder. (europa.eu)
Summary: We successfully show the possible existence of many-body localization and its phase transition in two dimensions. (europa.eu)
A quantum phase transition (QPT) takes place at zero temperature, as a result of the quantum fluctuations arising from Heisenberg uncertainty relation [ 1 ]. (frontiersin.org)
Usually, it manifests that the ground state of a quantum system changes upon tuning an external nonthermal parameter such as pressure or magnetic field to a critical value, which is marked by a quantum critical point (QCP) for a continuous transition. (frontiersin.org)
At 1.4 GPa, the ordered state breaks down upon a first-order transition, giving way to a new ground state marked by the coexistence of dynamically correlated and frozen spins. (bvsalud.org)
We report a new kagome quantum spin liquid candidate Cu 3 Zn(OH) 6 FBr, which does not experience any phase transition down to 50 mK, more than three orders lower than the antiferromagnetic Curie-Weiss temperature (∼200 K). A clear gap opening at low temperature is observed in the uniform spin susceptibility obtained from 19 F nuclear magnetic resonance measurements. (elsevierpure.com)
This enables us to account for a mysterious phase transition observed experimentally in spin ice in a magnetic field, which is a liquid-gas transition of the magnetic monopoles. (mpg.de)

1, it becomes an XY -type spin chain, the experimental realization of which is Cs 2 CoCl 4 [ 16 , 17 ], whose ground state lies in a TLL state. (frontiersin.org)
The helical metals can provide a unique platform for realization of an emergent protection of ballistic transport in quantum wires. (osti.gov)

The 2016 Nobel Prize in Physics was awarded to pioneering work opening the field of topological phases of matter. (cecam.org)

We also establish the presence of three crystalline phases in this system. (mpg.de)

Moving Target Detection Using a Distributed MIMO Radar System with Synchronization Errors (IEEE Transactions on Geoscience and Remote Sensing, 2023). (lu.se)
Designing FDA Radars Robust to Contaminated Shared Spectra (IEEE Transactions on Aerospace and Electronic Systems, 2023) [ pdf ]. (lu.se)

The principles of quantum mechanics are the gateway to a faster and more secure means of computing. (ist.ac.at)
Grover, L. K. Quantum mechanics helps in searching for a needle in a haystack. (nature.com)
Quantum mechanics is crucial in understanding the impact of superconducting science on condensed matter systems. (freescience.info)
It is assumed that students are familiar with quantum mechanics (including some scattering theory) and statistical physics. (tum.de)
To address these problems, we use a combination of analytical and numerical techniques of quantum field theory and statistical mechanics. (uibk.ac.at)
Thesis projects on topics in condensed matter theory are available, with a focus on the quantum mechanics of correlated systems. (lu.se)
thesis project, prior knowledge of advanced quantum mechanics and solid state physics are beneficial. (lu.se)

it seems that all complex spin interactions spread out across the material, and the measured spin interaction strength effectively vanishes. (ist.ac.at)
In many of these systems, SOC and other interactions lead to Kramers doublets on the d or f ions, which in turn are the building blocks for minimal effective models to capture the low-energy physics. (arxiv-vanity.com)
Near absolute zero, the lattice oscillations freeze, so that interactions between electron spins dominate. (phys.org)
Frustration occurs when spins in the system cannot find a simple ordered spin configuration to fully satisfy all the interactions with other spins [1,2]. (georgetown.edu)

Exact diagonalization calculations demonstrate that the shoulderlike anomaly can be reproduced in extended Kitaev models that gain proximity to an additional phase at finite field without entering it. (bvsalud.org)

Our results can be tested in ultracold atoms with photoassociation techniques by postselcting special measurement outcomes with the use of quantum-gas microscopy and pave the way for understanding non-Hermitian many-body physics triggered by exceptional manifolds in open quantum systems. (arxiv.org)

This gives rise to spatial regions of positive and negative synthetic fields such that the systems in fact resembles more a Chern insulator than a Hall insulator. (mpg.de)

Diagrammatic Keldysh nonequilibrium Green's function approach is also used in the group to investigate Open Quantum Systems. (icts.res.in)
At IST Austria, Kimberly Modic and her team will use their expertise to investigate quantum spin liquids and other modern quantum materials. (ist.ac.at)
Researchers have theorized a new mechanism to generate high-energy "quantum light," which could be used to investigate new properties of matter at the atomic scale. (phys.org)
The purpose of this laboratory exercise is to illustrate how we may investigate tiny energy splittings in an atomic system using laser spectroscopy. (lu.se)

The work of our group focuses on understanding such phases both from the point of view of theoretical framework building and experimental phenomenology. (icts.res.in)
The combined data is quantitatively compared to theoretical predictions of the spin structure factor taking into account the resolution of the various instruments. (mpg.de)
In the experiment, however, the researcher find out the lifetime of the system is significantly shorter than theoretical predictions, which could be attributed to a complex molecular spectrum in dressed system. (europa.eu)
Our findings show the many-body localization is not a theoretical artifact from numerical errors or finite size effect, but it exists in real system. (europa.eu)
He emphasizes computational methods as a theoretical technique, in particular the development of state-of-the-art algorithms for the study of strongly-interacting systems. (uwaterloo.ca)
We were able to show that quantum physical effects surprisingly only occur over very limited parameter ranges", explains theoretical physicist Prof. Johannes Reuther from the HZB, co-author of the study. (phys.org)
At Institut Néel, this research field is based on a very strong history in experimental and theoretical activities in quantum matter, in quantum electronic and mesoscopic physics, that was more recently reinforced by an important activity in quantum optics, and nanomechanics. (cnrs.fr)
This fundamental feature makes it necessary to adapt and further develop with theoretical guidance state-of-the-art numerical techniques (Quantum MonteCarlo, DMRG, etc...) or invent new algorithms/methods able to attack such problem. (cecam.org)

The group is also interested in some other topics which include stochastic processes, fluctuations and large deviations in non-equilibrium systems, extremal and geometrical properties of Brownian motions, first-passage problems and related stochastic search problems. (icts.res.in)
We find excellent agreement of the whole data set with distinct contributions of transversal and longitudinal spin fluctuations. (mpg.de)
However, when quantum fluctuations come in to play, these frustrated systems can realize a whole new level of exotica. (uwaterloo.ca)
Various types of valence bond solid (illustrated) or related states can arise when quantum fluctuations are present in a frustrated system. (uwaterloo.ca)
1) Different time windows: MuSR has a sensitivity to the spin fluctuation rate ranging between 10 6 to 10 11 [/sec], covering regions with slower fluctuations (lower energy transfers) than neutrons. (mrs.org)
MuSR's sensitivity to slow spin fluctuations helps this. (mrs.org)

Remarkably, we demonstrate the emergence of the dissipation-induced superfluid phase that is anomalously enlarged by a cusp on the phase boundary. (arxiv.org)

Motivated by the recent discovery of the quantum spin liquid (QSL) candidate material YbMgGaO4 and possible Kosterlitz-Thouless (KT) phase in TmMgGaO4, we successfully synthesized the Tm-based triangular lattice sister compound. (aps.org)

Due to complete muon spin polarization, muon spin rotation and relaxation (μ + SR) is a very powerful and sensitive tool to study local magnetic environments in condensed matters, even in a zero magnetic field [1]. (mrs.org)

Rev. B. This work reveals a first order phase boundary out of the field induced up-up-down state in this quantum spin liquid candidate system. (ucsb.edu)

Connection of physical systems (such as a collective behaviour of cold atoms) with integrable and non-integrable PDE's is an active area of interest for the group. (icts.res.in)
Most striking are the disordered "spin liquid" states, which are T=0 quantum collective paramagnets. (uwaterloo.ca)

Especially, we have studied the localized phase in two dimensions, where it is impossible to study with the current state-of-art numerical techniques. (europa.eu)
Guided by the recent discovery of SU($2$)$_1$ and SU($3$)$_1$ chiral spin liquids (CSL) on similar models we search for topological SU($N$)$_1$ CSL in some range of the Hamiltonian parameters via a combination of complementary numerical methods such as exact diagonalizations (ED), infinite density matrix renormalization group (iDMRG) and infinite Projected Entangled Pair State (iPEPS). (arxiv.org)

When magnons propagate across a non-collinear magnetic texture, they collect a Berry phase that can be interpreted as the flux of a synthetic orbital magnetic field. (mpg.de)
In the physics of the Fractional Quantum Hall (FQH) effect, a zoo of Abelian topological phases can be obtained by varying the magnetic field. (arxiv.org)
According to Onoda, "Our work indicates that the conductivity associated with the monopole current can be substantially controlled by applying a magnetic field to quantum spin ice and that it is possible to host dissipationless monopole current in the monopole supersolid phase. (nanowerk.com)
Using a triple axis spectrometer (BT-7), they studied the scattering of neutrons from carefully aligned single crystals in the low temperature antiferromagnetic phase including in different magnetic field conditions. (nanowerk.com)

In parallel with neutron scattering studies of the bulk, the NanoTransport system was used to examine the surface. (ornl.gov)
Furthermore, we employed neutron scattering techniques to probe the static and dynamic magnetic properties of this system. (aps.org)
The resolution of such a small energy scale poses a challenge to state-of-the-art neutron spectroscopy, and, for this reason, three distinct scattering methods were applied: time-of-flight, polarized triple-axis, and neutron spin-echo spectroscopy. (mpg.de)
We demonstrate, by diffuse neutron scattering, the presence of such strings in the spin-ice Dy2Ti2O7. (mpg.de)

The relation between the quantum critical phase and frustration has recently attracted intense attention 10, 11 . (researchsquare.com)

The Rydberg dressing technique is essential in realizing a supersolid phase, and the fellow successfully demonstrates this experimental scheme in many-body systems. (europa.eu)
After finding suitable parameter window that shows enough lifetime, experimental efforts towards the supersolid phase will be continued. (europa.eu)
The monopole supersolid phase survives until the magnetization saturates to the maximum value. (nanowerk.com)

Still, the experimental works provide a stepping stone to realize long-range interacting many-body system with Rydberg atoms. (europa.eu)
January 2015 - April 2015: Preparing experimental setup to demonstrate many-body localized phase. (europa.eu)
Our experimental results provide firm evidence for spin fractionalization in a topologically ordered spin system, resembling charge fractionalization in the fractional quantum Hall state. (elsevierpure.com)
Implementing topological quantum computation in realistic experimental systems [8] is one of the holy grails of the community. (cecam.org)

In my group we use computer simulations of realistic quantum lattice models to discover and characterize new examples of unconventional quantum critical points. (uwaterloo.ca)

Cirac, J. I. & Zoller, P. Quantum computations with cold trapped ions. (nature.com)

Here's the problem: while scientists theoretically predicted quantum spin liquids in the 1970s, experiments on candidate materials since then have not identified the smoking-gun signature of this new state of matter. (ist.ac.at)

Many researchers, like IST Professor Kimberly Modic , seek an alternative approach and a new state of matter known as a quantum spin liquid might be the answer. (ist.ac.at)
Dr. Melko's research tries to answer a fundamental set of questions in context of condensed-matter, quantum many-body, and quantum information theory. (uwaterloo.ca)
In our group, we study numerically the existence of laws in condensed-matter systems, as well as subleading scaling that has the potential to redefine classification schemes of condensed matter through access to universal physics. (uwaterloo.ca)
Chiral spin liquids are one of the most fascinating phases of matter ever imagined by physicists. (phys.org)
This branch of science offers a general overview of matter systems, including density, state physics, and body physics. (freescience.info)
These materials therefore represent a new state of quantum matter. (materialstoday.com)
Researchers have uncovered evidence that a material that is a prime candidate to be a quantum spin liquid represents a new phase of disordered matter. (materialstoday.com)

We don't know for sure yet if ruthenium-trichloride is a quantum spin liquid, but it has a very nontrivial magnetic response when subjected to magnetic fields. (ist.ac.at)
Recently, there has been a growing interest in studying magnetic systems with nontrivial magnon band topology. (mpg.de)

He is also interested in broader ideas in computational physics, the development of efficient algorithms for simulating quantum mechanical systems on classical computers, and the relationship of these methods to the field of quantum information science. (uwaterloo.ca)

Herein, we study the QPT and thermodynamics of 1D spin-1/2 anisotropic Heisenberg antiferromagnetic chains by Green's function theory. (frontiersin.org)

Even though many materials have been proposed as candidates for QSLs, there is no direct confirmation of QSLs in any of these systems. (utoronto.ca)
I will tackle the physics of quantum materials through a close collaboration with other members of FRIS. (tohoku.ac.jp)
The commonality in the assembled group is our interest and expertise in exploring potentials for magnesia-bearing construction materials in solving some of those new challenges, by either providing completely new solutions or enhanced solutions to existing material systems. (openaire.eu)
Beyond these fundamentals studies, these quantum materials are used for technological issues, like new superconducting magnet or detector for astrophysics, or future quantum information devices. (cnrs.fr)

Anatomy6

Organisms4

Chemicals and Drugs91

Analytical, Diagnostic and Therapeutic Techniques and Equipment66

Phenomena and Processes70

Disciplines and Occupations14

Technology, Industry, Agriculture15

Information Science11

Health Care8

Condensed matter8

Transitions15

Magnetism5

Excitations11

Superconductivity5

Criticality8

Electrons12

Symmetry8

Exotic7

Phenomena9

Insulators2

Entanglement10

Pyrochlore9

Interplay4

Magnets1

Fermi3

Dynamics9

Correlations4

Chiral quantum1

Monte Carlo10

Diagram5

Solids2

Microscopic7

Behavior7

Transition10

Realization2

20161

Crystalline phases1

20232

Mechanics7

Interactions4

Kitaev1

Ultracold1

Chern1

Investigate4

Theoretical8

Fluctuations6

Superfluid1

Triangular lattice1

Muon spin rotation1

Field-induced1

Collective2

Numerical2

Magnetic field4

Neutron4

Frustration1

Supersolid3

Experimental4

Unconventional quantum1

Ions1

Theoretically1

Matter7

Nontrivial2

Algorithms1

Heisenberg1

Materials4