# PubMed Journals Articles About "Thermal Hall Effect Induced Magnon Phonon Interactions"

20:01 EST 15th December 2019 | BioPortfolio

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## Showing "Thermal Hall Effect Induced Magnon Phonon Interactions" PubMed Articles 1–25 of 39,000+

Thermal Hall Effect Induced by Magnon-Phonon Interactions.

We propose a new mechanism for the thermal Hall effect in exchange spin-wave systems, which is induced by the magnon-phonon interaction. Using symmetry arguments, we first show that this effect is quite general, and exists whenever the mirror symmetry in the direction of the magnetization is broken. We then demonstrate our result in a collinear ferromagnet on a square lattice, with perpendicular easy-axis anisotropy and Dzyaloshinskii-Moriya interaction from mirror symmetry breaking. We show that the therma...

Strongly coupled magnon-phonon dynamics in a single nanomagnet.

Polaritons are widely investigated quasiparticles with fundamental and technological significance due to their unique properties. They have been studied most extensively in semiconductors when photons interact with various elementary excitations. However, other strongly coupled excitations demonstrate similar dynamics. Specifically, when magnon and phonon modes are coupled, a hybridized magnon-phonon quasiparticle can form. Here, we report on the direct observation of coupled magnon-phonon dynamics within a...

Topological phases of higher Chern numbers in Kitaev-Heisenberg ferromagnet with further-neighbor interactions.

Emergence of multiple topological phases with a series of Chern numbers, &#13; $\pm 1$, $\mp 1$, $\pm 2$, $\mp 2$, $\pm 3$ and $\mp 4$, is &#13; found in a ferromagnetic &#13; Kitaev-Heisenberg-spin-anisotropic model on honeycomb lattice with &#13; further neighbor interactions in the presence of an external magnetic field. &#13; Magnon Chern insulating dispersions of this two-band model are studied &#13; by using linear spin-wave theory formulated on the exact &#13; ferromagneti...

Spin-Hall effect of light at a tilted polarizer.

We describe the spin-Hall effect of light (as well as the angular Goos-Hänchen effect) at a tilted linear-dichroic plate, such as a usual linear polarizer. Although the spin-Hall effect at a tilted polarizer was previously associated with the geometric spin-Hall effect of light (which was contrasted to the regular spin-Hall effect) [Phys. Rev. Lett.112, 113902 (2014) PRLTAO0031-900710.1103/PhysRevLett.112.113902], we show that the effect is actually an example of the regular spin-Hall effect that occurs at...

Phonon Anharmonicity in Few-Layer Black Phosphorus.

We report a temperature-dependent Raman spectroscopy study of few-layer black phosphorus (BP) with varied incident polarization and sample thickness. The Raman-active modes A$_\text{g}^{1}$, B$_\text{2g}$, and A$_\text{g}^{2}$ exhibit a frequency downshift, while their linewidth tends to increase with increasing temperature. To understand the details of these phenomena, we perform first-principles density functional theory calculations on freestanding monolayer BP. The effect of thermal expansion is include...

Coupled plasmon-phonon modes in monolayer MoS2.

We present a theoretical study of the plasmon-phonon coupling in a suspended monolayer MoS2 and a MoS2 substrate system using a diagrammatic selfconsistent field theory. The four coupled plasmon-phonon modes and the four plasmonsurface phonon modes are observed due to the spin-obit and electron-optic phonon interactions. The two of coupled plasmon-phonon and plasmon-surface phonon modes are optic-like and the other two are acoustic-like. The plasmon are strongly coupled with the optic-phonon in MoS2 and the...

Anomalous temperature dependent thermal conductivity of two dimensional silicon carbide.

Recently, two-dimensional silicon carbide (2D-SiC) has attracted considerable interest due to its exotic electronic and optical properties. Here, we explore the thermal properties of 2D-SiC using reverse non-equilibrium molecular dynamics simulation. At room temperature, a thermal conductivity of ~313 W/mK is obtained for 2D-SiC which is one order higher than that of silicene. Above room temperature, the thermal conductivity deviates the normal 1/T law and shows an anomalous slowly decreasing behavior. To e...

Phononic thermal transport properties of C3N nanotubes.

Reverse non-equilibrium molecular dynamics (RNEMD) is employed to study the phononic thermal transport properties of CN nanotubes. We study the effect of nanotube length and diameter on the thermal conductivity and investigate the phonon transport transition from ballistic to diffusive regime in CN nanotubes. It is found that the thermal conductivity of C3N nanotubes is significantly lower than those of carbon nanotubes across the entire ballistic diffusive range. In addition, significantly lower ballistic ...

Disorder limits the coherent phonon transport in two-dimensional phononic crystal structures.

Recently, increasing efforts are being made to control thermal transport via coherent phonons in periodic phononic structures; however, the direct observation of coherent phonon transport is experimentally very difficult at ambient temperature, and the importance of coherent phonons to the total thermal conductivity has not been critically assessed to date. In this study, using the non-equilibrium molecular dynamics simulations, we studied coherent phonon transport in a C3N phononic crystal (CNPnC) structur...

Intrinsic Low Thermal conductivity and Phonon Renormalization Due to Strong Anharmonicity of Single-Crystal Tin Selenide.

Two-dimensional (2D) van der Waals material tin selenide (SnSe) has recently attracted intensive interest due to its exceptional thermoelectric properties. However, the thermal properties and phonon transport mechanisms in its single-crystal form remain elusive. Here, we measured high-quality SnSe single crystals using nanoscale thermometry based on ultrafast optical spectroscopy, and found that its intrinsic thermal conductivity is highly anisotropic in different crystallographic directions. To quantify ph...

First-principles study of thermal transport properties in the two- and three-dimensional forms of BiOSe.

Recently, an air-stable layered semiconductor Bi2O2Se has been synthesized [Nat. Nanotechnol., 2017, 12, 530; Nano Lett. 2017, 17, 3021]. It possesses ultrahigh mobility, semiconductor properties, excellent environmental stability and easy accessibility. Here, we report on the thermal transport properties in monolayer (ML), bilayer (BL), and bulk forms of Bi2O2Se using density-functional theory and the Boltzmann transport approach. The results show that the ML exhibits better thermal transport properties th...

The Equal Footing of Thermal Expansion and Electron-Phonon Interaction in the Temperature Dependence of Lead Halide Perovskite Band Gaps.

Lead halide perovskites, which are causing a paradigm shift in photovoltaics, exhibit an atypical temperature dependence of the fundamental gap: it decreases in energy with decreasing temperature. Reports ascribe such a behavior to a strong electron-phonon renormalization of the gap, neglecting contributions from thermal expansion. However, high pressure experiments performed on the archetypal perovskite MAPbI (MA stands for methylammonium) yield a negative pressure coefficient for the gap of the tetragonal...

Magnus Hall Effect.

A new type of a linear response Hall effect is predicted in time-reversal-invariant systems with a built-in electric field at zero magnetic field. The Hall response results from a quantum Magnus effect where a self-rotating Bloch electron wave packet moving under an electric field develops an anomalous velocity in the transverse direction. We show that in the ballistic limit the Magnus Hall conductance measures the distribution of the Berry curvature on the Fermi surface.

Gigahertz Frequency Antiferromagnetic Resonance and Strong Magnon-Magnon Coupling in the Layered Crystal CrCl_{3}.

We report broadband microwave absorption spectroscopy of the layered antiferromagnet CrCl_{3}. We observe a rich structure of resonances arising from quasi-two-dimensional antiferromagnetic dynamics. Because of the weak interlayer magnetic coupling in this material, we are able to observe both optical and acoustic branches of antiferromagnetic resonance in the GHz frequency range and a symmetry-protected crossing between them. By breaking rotational symmetry, we further show that strong magnon-magnon coupli...

The role of mid-gap phonon modes in thermal transport of transition metal dichalcogenides.

We present a comprehensive theoretical study on thermal transport in monolayer transition metal dichalcogenides MX2 (M: Mo, W; X: S, Se) with various sample sizes. An unusually high anharmonic scattering strength is found in MoSe2 compared to the other three family members, which arises from its unique phonon band dispersion, specifically the mid-frequency phonon branches associated with the vibrations of Se atoms of MoSe2. The mid-frequency modes almost completely span the gap that exists between the high-...

Low thermal conductivity of peanut-shaped carbon nanotube and its insensitive response to uniaxial strain.

Motivated by the experimental synthesis of peanut-shaped carbon nanotubes (PSNTs) that combine the novel features of fullerene and carbon nanotube (CNT), we study the thermal conductivity of a PSNT (1dp08) and its response to different strains by using non-equilibrium molecular dynamics simulations and lattice dynamics together with density functional theory. We find that the thermal conductivity of the PSNT is reduced by more than 90% as compared to that of CNTs, and remains almost the same when different ...

Monolayer SnP: an excellent p-type thermoelectric material.

Monolayer SnP3 is a novel two-dimensional (2D) semiconductor material with high carrier mobility and large optical absorption coefficient, implying its potential applications in the photovoltaic and thermoelectric (TE) fields. Herein, we report on the TE properties of monolayer SnP3 utilizing first principles density functional theory (DFT) together with semiclassical Boltzmann transport theory. Results indicate that it exhibits a low lattice thermal conductivity of ∼4.97 W m-1 K-1 at room temperature, ma...

Highly Anisotropic Thermal Transport in LiCoO.

LiCoO2 is the prototypical cathode in lithium-ion batteries. Its crystal structure consists of Li+ and CoO2- layers that alternate along the hexagonal axis. It is well established that the ionic and electronic conduction are anisotropic, but little is known regarding the heat transport. We analyse the phonon dispersion and lifetimes using anharmonic lattice dynamics based on quantum-chemical force constants. Around room temperature, the thermal conductivity in the hexagonal ab plane of the layered cathode ...

Tunable thermal transport in a WS monolayer with isotopic doping and fractal structure.

An emerging two-dimensional (2D) tungsten disulfide (WS2) has been attracting much attention due to its excellent physical properties. In this work, the thermal transports in isotopically doped WS2 monolayers modified with Rectangle Carpet (RC) and Sierpinski Carpet (SC) structures are investigated systematically using molecular dynamics simulations. The effects of fractal number and temperature on thermal conductivity (k) are evaluated. The SC fractal structures have lower thermal conductivities in compari...

Observation of quantum topological Hall effect in the Weyl semimetal candidate HgSe.

The magnetoresistance and Hall effect of a single HgSe crystal with an extremely low electron concentration of 8.8×10&lt;sup&gt;15&lt;/sup&gt; cm&lt;sup&gt;-3&lt;/sup&gt; were studied in a quantising magnetic field applied both along and across the direction of the electric current. As the result, a broad plateau was discovered in the ordinary (transverse) Hall resistance in the quantum limit. Within a framework of quantum spin Hall effect for an inversion breaking Weyl semi...

Spin-Hall Topological Hall Effect in Highly Tunable Pt/Ferrimagnetic-Insulator Bilayers.

Electrical detection of topological magnetic textures such as skyrmions is currently limited to conducting materials. While magnetic insulators offer key advantages for skyrmion technologies with high speed and low loss, they have not yet been explored electrically. Here, we report a prominent topological Hall effect in Pt/TmFeO bilayers, where the pristine TmFeO epitaxial films down to 1.25 unit cell thickness allow for tuning of topological Hall stability over a broad range from 200 to 465 K through atomi...

Nanomachining-enabled strain manipulation of magnetic anisotropy in the free-standing GaMnAs nanostructures.

Strain perturbs atomic ordering in solids, with far-reaching consequences from an increased carrier mobility to localization in Si, stabilization of electric dipoles and nanomechanical transistor action in oxides, to the manipulation of spins without applying magnetic fields in n-GaAs. In GaMnAs, a carrier-mediated ferromagnetic semiconductor, relativistic spin-orbit interactions - highly strain-dependent magnetic interactions - play a crucial role in determining the magnetic anisotropy (MA) and anisotropic...

Thermal-transport studies of kagomé antiferromagnets.

Searching for the ground state of a kagomé Heisenberg antiferromagnet (KHA) has been one of the central issues of condensed-matter physics, because the KHA is expected to host spin-liquid phases with exotic elementary excitations. Here, we show our longitudinal (κ_xx) and transverse (κ_xy) thermal conductivities measurements of the two kagomé materials, volborthite and Ca kapellasite. Although magnetic orders appear at temperatures much lower than the antiferromagnetic energy scale in both materials, th...

Superconducting Correlations Out of Repulsive Interactions on a Fractional Quantum Hall Edge.

We consider a fractional quantum Hall bilayer system with an interface between quantum Hall states of filling fractions (ν_{top},ν_{bottom})=(1,1) and (1/3,2), motivated by a recent approach to engineering artificial edges [Y. Ronen et al., Nat. Phys. 14, 411 (2018)NPAHAX1745-247310.1038/s41567-017-0035-2]. We show that random tunneling and strong repulsive interactions within one of the layers will drive the system to a stable fixed point with two counterpropagating charge modes which have attractive int...

Skyrmions and Hall Transport.

In this article, we review new progress towards an understanding of the Skyrmion Hall transport in insulating materials as well as in conducting materials. First, we consider theoretical breakthroughs based on the quantum field theory Ward identities, &lt;i&gt;first principle analyses&lt;/I&gt;, relying on symmetries and conservation laws. Broken parity (inversion) symmetry plays a crucial role in Skyrmion Hall transport. In addition to the well known thermal and electric Hall conductivities...

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