Phonons. Medical search. Frequent questions (1)

The obtained results can lead to more efficient nanoscale control of acoustic phonons, with benefits for nanoelectronic, thermoelectric and spintronic devices. (nature.com)
Acoustic phonons carry heat in semiconductors. (nature.com)
The magnitude of the two forces reveals that the in-plane and flexural acoustic phonons are at very different temperatures in the steady state, with typically observed values of the ratio ΔTLA+TA/ΔTZA between 0.2 and 3.7. (tudelft.nl)
We report on measurements of acoustic phonons on Bi$_2$(La,Sr)$_2$CuO$_{6+\delta}$, which reveal a coupling to an underlying electronic density-wave state. (aps.org)
Longitudinal acoustic phonons are found to be anomalously broadened at a wavevector of q $\approx$ 1/4 rlu along the Cu-O direction. (aps.org)
In the case of acoustic phonons, this leads to different behavior: coherent acoustic phonons, also called sound waves, are used for ultrasonic imaging, while incoherent acoustic phonons are responsible for heat propagation in semiconductors and insulators. (lu.se)

Researchers from North Carolina State University and the University of North Carolina at Chapel Hill used chiral phonons to convert wasted heat into spin information - without needing magnetic materials. (ncsu.edu)
We used chiral phonons to create a spin current at room temperature without needing magnetic materials," says Dali Sun, associate professor of physics and member of the Organic and Carbon Electronics Lab (ORaCEL) at North Carolina State University. (ncsu.edu)
By applying a thermal gradient to a material that contains chiral phonons, you can direct their angular momentum and create and control spin current. (ncsu.edu)
Chiral phonons are groups of atoms that move in a circular direction when excited by an energy source - in this case, heat. (ncsu.edu)
A gradient is needed because temperature difference in the material - from hot to cold - drives the motion of the chiral phonons through it," says Liu. (ncsu.edu)
Chiral phonons possessing angular momentum arising from the broken symmetry of a non-magnetic material creates the potential for generating spin currents at room temperature in response to a thermal gradient, precluding the need for a ferromagnetic contact. (ncsu.edu)
Here we show the observation of spin currents generated by chiral phonons in a two-dimensional layered hybrid organic-inorganic perovskite implanted with chiral cations when subjected to a thermal gradient. (ncsu.edu)

The study of phonons is an important part of condensed matter physics. (wikipedia.org)

To try and figure out if it was Elisa or Gstreamer causing the problems, I told Phonon to use Gstreamer as a back-end and tried the same files in Dragon Player. (opensuse.org)
As for Phonon, there aren't any specific options for the Gstreamer back-end (using the latest 4.2 from Factory: Desktop repo). (opensuse.org)
The 'phonon' package only includes the gstreamer backend. (archlinux.org)
phonon-gstreamer doesnt display stream meta-data correctly in amarok. (kde.org)
KDE Bugtracking System - Bug 300189 phonon-gstreamer doesnt display stream meta-data correctly in amarok. (kde.org)
phonon-gstreamer doesnt correctly display the meta-data In Amarok, in the prorgress bar. (kde.org)
This bug is solved for me with latest Phonon-GStreamer (4.6.1). (kde.org)
cherub.rockin: Can you confirm znurree's comment that this is fixed in Phonon-GStreamer 4.6.1? (kde.org)

Now, Jiade Li of China's Institute of Physics and his collaborators have used a type of electron spectroscopy to demonstrate that graphene, which has already been shown to have topological electrons, has topological phonons [ 1 ]. (aps.org)
Here we report results of Brillouin-Mandelstam light scattering spectroscopy, which reveal multiple (up to ten) confined acoustic phonon polarization branches in GaAs nanowires with a diameter as large as 128 nm, at a length scale that exceeds the grey phonon mean-free path in this material by almost an order-of-magnitude. (nature.com)
There are many experimental reports of the phonon wave effects in periodic structures, including the early Raman spectroscopy studies in semiconductor superlattices 20 . (nature.com)
A finite-range Fröhlich electron-phonon interaction (EPI) with c-axis polarized optical phonons has been identified in cuprate superconductors by photoemission spectroscopy, in agreement with an earlier proposal by Alexandrov and Kornilovitch [1]. (open.ac.uk)
Herein, the origins of the carrier-phonon coupling in 2D perovskites using transient absorption (TA) spectroscopy are explicated. (lu.se)
With coherent phonon spectroscopy, we can monitor all these processes, as shown in the figure Signal . (lu.se)
One of the main applications of coherent phonon spectroscopy is the characterization of material properties. (lu.se)

In this talk, I will discuss a number of basic issues associated with phonon chirality, such as the angular momentum carried by circularly polarized phonons, electronic magnetization induced by such phonons, and the creation of phonon chirality from time reversal symmetry breaking. (uci.edu)
As the phonons move through a material, they propagate that circular motion, or angular momentum, through it. (ncsu.edu)
To explain these phenomena, we derive a coupling mechanism between the phonon angular momentum and the electron spin. (arxiv.org)

We analyze heat current fluctuations between electrons and phonons in a metal. (springer.com)
The combination of the phonon dominance in energy transport with the large Hall angle of electrons and frequent momentum exchange between electrons and phonons generates a trasnverse thermal gradient , larger than what electrons and phonons alone can produce. (aps.org)

The solution was to link phonon_backend, as Hugo said. (archlinux.org)
The xine backend isn't included in the 'phonon' package. (archlinux.org)

Controlling the phonon spectrum via spatial confinement would allow for fine-tuning of the phonon interactions with electrons, spins and other phonons, particularly at low temperature. (nature.com)
Reducing the material sizes to the nanometer length scale leads to drastic modifications of the propagating lattice excitations (phonons) and their interactions with electrons and magnons. (rsc.org)
Study of the lattice dynamics is key in understanding the electron-phonon interactions at play, responsible for such properties. (cea.fr)
In this article, we discuss the consequences of long-range interactions on phonon-mediated local pairing. (open.ac.uk)
Owing to spin-orbit and dipole- dipole interactions, phonons and magnons are coupled to each other, which could lead to the coherent oscillation between magnons and phonons if the coupling is strong enough. (spintec.fr)

We present a joint experiment-theory analysis of the temperature-dependent emission spectra, zero-phonon linewidth, and second-order correlation function of light emitted from a single organic molecule. (bris.ac.uk)
We observe spectra with a zero-phonon line together with several additional sharp peaks, broad phonon sidebands, and a strongly temperature dependent homogeneous broadening. (bris.ac.uk)
We investigate the distribution and temperature-dependent optical properties of sharp, zero-phonon emission from defect-based single photon sources in multilayer hexagonal boron nitride (h-BN) flakes. (arxiv.org)
We also present a detailed study of the temperature-dependent linewidth, spectral energy shift, and intensity for two different zero-phonon lines centered at 575 nm and 682 nm, which reveals a nearly identical temperature dependence despite a large difference in transition energy. (arxiv.org)

Analogous to switching in transistors, manipulating these excitonic properties in 2D perovskites using coherent phonons could unlock new applications. (lu.se)
Originating from impulsive stimulated Raman scattering, these coherent vibrations manifest as oscillations in the TA spectrum comprising of the generation and detection processes of coherent phonons. (lu.se)
On top of that, oscillations can be seen: they are cause by the interaction of light with coherent phonons. (lu.se)
With the pump-probe technique, we can study coherent phonons, but what do we mean by coherent? (lu.se)
Coherent phonons are a result of the interaction of light with electron and lattice. (lu.se)

The ultrafast control of emergent magnetism by means of phonons opens up new tuning mechanisms for functional materials. (arxiv.org)
His research topic is ultrafast dynamics on the timescale of a phonon period in hard condensed matter. (lu.se)

Low temperature spectra reveal weakly dispersive optical phonons, at energies as low as 2-5 meV, which seem to be the origin of the limit of the charge carriers mobilities in these materials. (cea.fr)
The temperature dependence of our neutron spectra shows as well a significant anharmonic behaviour, resulting in optical phonon overdamping at temperatures as low as 80 K, questionning the validity of the quasi-particle picture for the low energy optical modes at room temperature where the solar cells operate. (cea.fr)
We use density functional theory to calculate the electronic band structures, cohesive energies, phonon dispersions, and optical absorption spectra of two-dimensional In2X2 crystals, where X is S, Se, or Te. (lancs.ac.uk)
Degenerate line modes in the surface and bulk phonon spectra of orthor" by Jianhua Wang, Hongkuan Yuan et al. (edu.au)

Calculations of the relative change in the Raman scattering cross sections underline the potential of our microresonator for the optical control of nonequilibrium phonon populations in SWNT. (uni-muenchen.de)

We briefly discuss the impact of electron-phonon heat current fluctuations on calorimetry, particularly in the regime of single microwave-photon detection. (springer.com)
V.F. Gantmakher, The experimental study of electron-phonon scattering in metals. (springer.com)
Similar to electron waves, the phonon states in semiconductors can undergo changes induced by external boundaries. (nature.com)
Recent technological developments suggest that tuning the phonon energy dispersion may become as important for the next generation of nanoelectronic circuits as engineering of the electron dispersion. (nature.com)
The phonon, like the photon or electron, is a physical particle that travels like waves, representing mechanical vibration. (phys.org)
Theoretically, electron-phonon scattering is a tough problem, made doubly so by the fact that electrons interact also with each other. (qub.ac.uk)
Despite big strides in the theory and simulation of electron dynamics and atomic motion in nanoscale systems, this crucial problem - the interplay between electron-phonon and electron-electron scattering - remains rather open. (qub.ac.uk)
Labbé and Bok [ 5 ] proposed the Van Hove scenario for the cuprates, using electron-phonon interaction and predicted an anomalous isotope effect. (hindawi.com)
The strong correlations are surely very important in the underdoped regime but we shall show that electron-phonon interaction coupled with the Van Hove scenario may explain must of the properties in the region of optimum doping and the overdoped region. (hindawi.com)
The analysis of the latter case points to a phonon-electron mutual drag mecahnism, generating a novel contribution in addition to the phononic and electronic terms. (aps.org)

Recent theory has predicted large temperature differences between the in-plane [longitudinal (LA) and transverse (TA)] and out-of-plane [flexural (ZA)] acoustic phonon baths in locally heated suspended graphene. (tudelft.nl)
Here, we present a method to determine the acoustic phonon bath temperatures from the frequency-dependent mechanical response of suspended graphene to a power-modulated laser. (tudelft.nl)
There are many types of polaritons due to the different excitations of materials, such as plasmon polariton (PPs) in graphene, phonon polaritons (PhPs) in hBN, exciton polaritons (EPs) in transition-metal dichalcogenides. (auburn.edu)

A type of quasiparticle, a phonon is an excited state in the quantum mechanical quantization of the modes of vibrations for elastic structures of interacting particles. (wikipedia.org)
The interaction between electrons and atomic vibrations (phonons) is a beautiful example of how a process from the heart of quantum mechanics can impact on us every day: this is how current heats up wires making your toaster work. (qub.ac.uk)
Hyperbolic phonon polaritons (HPhPs) are stimulated by coupling infrared (IR) photons with the polar lattice vibrations. (soton.ac.uk)
in the right panel) to study the phonons, or vibrations, of a material. (lu.se)

In physics, a phonon is a collective excitation in a periodic, elastic arrangement of atoms or molecules in condensed matter, specifically in solids and some liquids. (wikipedia.org)
In a magnetic material, various elementary excitations are responsible for physical properties of the material, including the excitation of lattice and magnetic order, phonons and magnons. (spintec.fr)
Here, we demonstrate intra-cavity excitation and time-domain sampling of coherent optical phonons inside an active laser oscillator. (arxiv.org)
High intensity THz lasers allow for the coherent excitation of individual phonon modes. (arxiv.org)

These results provide a detailed microscopic understanding of phase stability and thermal transport in technologically important materials, providing further insights on ways to control phonon propagation in thermoelectrics, photovoltaics, and other materials requiring thermal management. (ornl.gov)
In a Bi-doped magnetic garnet, Lu 2 Bi 1 Fe 3.4 Ga 1.6 O 12 , we observed coherent temporal oscillation between magnons and phonons as a result of hybridization, where magnons and phonons are coherently interconverted to each other during propagation. (spintec.fr)
With the rise of femtosecond lasers, it is now possible to achieve resolution down to tens of femtoseconds, allowing the investigation of the interaction between charge and phonons, and the propagation of sound waves with a spatial resolution below the nanometer. (lu.se)

Phonons can be thought of as quantized sound waves, similar to photons as quantized light waves. (wikipedia.org)

However, despite strong scientific and practical importance, conclusive experimental evidence of confined acoustic phonon polarization branches in individual free-standing nanostructures is lacking. (nature.com)
Despite the strong motivations, and a large body of theoretical studies 10 , 11 , experimental investigation of the acoustic phonon confinement effects in individual nanostructures-as opposed to periodic composites-is lagging behind. (nature.com)
Establishing the existence of confined phonon subbands in free-standing nanostructures, and determining the length scale, D , at which they reveal themselves are important tasks. (nature.com)

Finally, in Chapter 5 we proposed a new approach to achieve topological transitions of phonon polaritons in hBN/calcite heterostructure. (auburn.edu)

Extended anharmonic collapse of phonon dispersions in SnS and SnSe. (ornl.gov)

Therefore, a comprehensive investigation of the lattice dynamics and spin-phonon interaction in EuO films is necessary for practical applications. (rsc.org)
The experimental demonstration of these dynamics of magnon- phonon hybridized waves will be presented in the talk. (spintec.fr)

Other lattices include a linear chain, which is a very simple lattice which we will shortly use for modeling phonons. (wikipedia.org)

For most general stuff, I use Xine (via Phonon, through Amarok and Dragon Player). (opensuse.org)

To test the applicability of the analytic results to experimentally achievable couplings and phonon frequencies, we apply a continuous time quantum Monte-Carlo algorithm (CTQMC) to the computation of the effective mass and pairing radius of lattice bipolarons. (open.ac.uk)

Improving phonon transport in nanometer scale devices is crucial for their reliability. (nature.com)

Like electrons, phonons move about a crystal in ways prescribed by a band structure, which can also have topological features. (aps.org)
The team's detailed map contains two types of topological feature-Dirac points and nodal rings-which appear at locations where the phonon bands cross. (aps.org)
The coincidence of the crossings and the topological features do not necessarily signify the presence of topological phonons. (aps.org)
The researchers' next goal is to detect topological phononic edge states, which they say could be harnessed to make phonon diodes and other "phononic" devices. (aps.org)

This two-step process leads to a unique pump- and probe-energy dependence of the phonon modulation determined by the imaginary part of the refractive index and its derivative, respectively. (lu.se)

However, photons are fundamental particles that can be individually detected, whereas phonons, being quasiparticles, are an emergent phenomenon. (wikipedia.org)
This study injects fresh insights into the exciton-phonon coupling of 2D perovskites relevant for emergent optoelectronics development. (lu.se)

Phonons transmit everyday sound and heat. (phys.org)
The researchers demonstrated chiral phonon-generated spin currents in a two-dimensional layered hybrid organic-inorganic perovskite by using a thermal gradient to introduce heat to the system. (ncsu.edu)
The advantage offered by fs-LA is due to shorter pulse duration of the laser as compared to the phonon relaxation time and heat diffusion time. (cdc.gov)
Phonon heat transfer across a vacuum through quantum fluctuations. (bvsalud.org)

Our simulations of anharmonic phonon renormalization go beyond low-order perturbation theory and capture these striking effects, showing that the large phonon shifts directly affect the thermal conductivity by altering both the phonon scattering phase space and the group velocities. (ornl.gov)

Since phonons have longitudinal and transverse modes, both modes may not be an eigenstate where translational symmetry is broken down, such as a sample edge. (spintec.fr)

While theoretically predicted phonon magnetic moments are tiny, recent experiments hint towards a significant magnetization in various materials. (arxiv.org)

Here, we investigate, via neutron and Raman spectroscopies, the optical phonon spectrum of four different HOP single crystals: MAPbBr 3 , FAPbBr 3 , MAPbI 3 , and α -FAPbI 3 . (cea.fr)
We identify two crystalline phases (alpha and beta) of monolayers of hexagonal In2X2, and show that they are characterized by different sets of Raman-active phonon modes. (lancs.ac.uk)
Wir zeigen, wie man die Größenverteilung der Halbleiter-Nanokristalle in einer quantitativen Weise zu bestimmen unter Verwendung der Raman-Spektroskopie unter Verwendung eines analytisch definierten Mehrkorn Phonon-Confinement-Modell. (jove.com)
Employing real-time spectral interferometry, we reveal that Terahertz beats of Raman-active optical phonons can bind temporal solitons to bound-states - termed "Soliton molecules" - and we resolve a coherent coupling mechanism of phonon and intra-cavity soliton motion. (arxiv.org)

A phonon is the quantum mechanical description of an elementary vibrational motion in which a lattice of atoms or molecules uniformly oscillates at a single frequency. (wikipedia.org)
To be clear: I'm trying to avoid a discussion of multi-phonon scattering, because I'm only interested in an 'equilibrium' snapshot in time / the 'mean' vibrational state of the perfect crystal. (physicsforums.com)
The exciton fine structure is modulated by coherent optical phonons dominated by the vibrational motion of the PbI 6 octahedra via deformation potential. (lu.se)
Our model includes both localized vibrational modes of the molecule and a thermal phonon bath, which we include nonperturbatively, and is able to capture all observed features. (bris.ac.uk)

New experiments reveal graphene's exotic phonon spectrum with unprecedented detail and completeness. (aps.org)

The phonon confinement effects result in a decrease in the phonon group velocity along the nanowire axis and changes in the phonon density of states. (nature.com)

With a diatomic basis, I don't see why you don't also consider k=0 for the optical phonons. (physicsforums.com)
Phonon-induced optical dephasing in single organic molecules," Phys. (bris.ac.uk)

Herein, we propose that degenerate surface-line phonon modes can also emerge in solids with orthorhombic structures. (edu.au)

In this talk, the experimental direct observation of the coherent oscillation between magnons and phonons are presented, together with demonstration of anomalous reflection of magnons owing to magnon-phonon hybridization [1]. (spintec.fr)

Note that /usr/share/kde4/services/phononbackends/xine.desktop and /usr/lib/kde4/phonon_xine.so are owned by the 'kdebase-runtime' package. (archlinux.org)

In EuO, a promising material for spintronic applications in which a giant spin-phonon interaction is present, this might imply a reduction of the degree of spin polarization in thin films. (rsc.org)

People know about electrons because of computers, and electromagnetic waves because of cell phones, but not so much about phonons," said Martin Maldovan, a research scientist in the School of Chemical and Biomolecular Engineering at the Georgia Institute of Technology. (phys.org)

While normal modes are wave-like phenomena in classical mechanics, phonons have particle-like properties too, in a way related to the wave-particle duality of quantum mechanics. (wikipedia.org)

A microscopic approach to the frohlich model of bose condensation of phonons in biological systems. (bvsalud.org)

Nothing more fair from that, as there is a 'phonon' package in our repositories. (archlinux.org)

By reducing the EuO layer thickness from 8 nm to a sub-monolayer coverage, the Eu-partial phonon density of states (PDOS) reveals a gradual enhancement of the number of low-energy phonon states and simultaneous broadening and suppression of the peaks. (rsc.org)

Acoustic phonons6

Chiral Phonons7

Condensed matter1

Gstreamer8

Spectroscopy7

Angular momentum3

Electrons and phonons2

Backend2

Interactions5

Zero-phonon4

Coherent phonons5

Ultrafast2

Spectra4

Nonequilibrium1

Electron10

Graphene3

Vibrations4

Excitation4

Propagation3

Sound waves1

Nanostructures3

Polaritons1

Dispersions1

Dynamics2

Lattices1

Amarok1

Couplings1

Nanometer1

Topological4

Modulation1

Emergent2

Heat4

Anharmonic1

Longitudinal1

Theoretically1

Raman4

Vibrational4

Spectrum1

Confinement1

Optical2

Solids1

Observation1

Xine1

Spintronic1

Waves1

Quantum1

Bose1

Repositories1

Peaks1