Phonon softening near topological phase transitions

Yue, Shidong; Deng, Bowen; Liu, Yanming; Quan, Yujie; Yang, Runqing; Liao, Bolin

doi:10.1103/physrevb.102.235428

Cited by 18 publications

(13 citation statements)

References 66 publications

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“…4d, signaling strong Kohn anomalies. The same phonon softening effect was also found near a chemical-composition-induced topological phase transition in Hg1−xCdxTe [79].…”

Section: ⅲ2 Real Part Of the Phonon Self-energy: Phonon Frequency Ren...supporting

confidence: 69%

“…4b. Along this line, Yue et al further showed that these soft phonons can be sensitively tuned across topological phase transitions driven by external stimuli, where the semimetallic phase appear at the phase transition point [79]. For example, ZrTe5 undergoes a topological phase transition when subjected to a hydrostatic pressure of 5 GPa, where the electronic band gap closes and a semimetallic phase emerges, as shown in Fig.…”

Section: ⅲ2 Real Part Of the Phonon Self-energy: Phonon Frequency Ren...mentioning

confidence: 90%

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Impact of Electron-Phonon Interaction on Thermal Transport: A Review

Quan

Yue

Liao

2021

Nanoscale and Microscale Thermophysical Engineering

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A thorough understanding of the microscopic picture of heat conduction in solids is critical to a broad range of applications, from thermal management of microelectronics to more efficient thermoelectric materials. The transport properties of phonons, the major microscopic heat carriers in semiconductors and insulators, particularly their scattering mechanisms, have been a central theme in microscale heat conduction research. In the past two decades, significant advancements have been made in computational and experimental efforts to probe phonon-phonon, phononimpurity, and phonon-boundary scattering channels in detail. In contrast, electron-phonon scatterings were long thought to have negligible effects on thermal transport in most materials under ambient conditions. This article reviews the recent progress in first-principles computations and experimental methods that show clear evidence for a strong impact of electron-phonon interaction on phonon transport in a wide variety of technologically relevant solid-state materials.Under thermal equilibrium conditions, electron-phonon interactions can modify the total phonon scattering rates and renormalize the phonon frequency, as determined by the imaginary part and the real part of the phonon self-energy, respectively. Under nonequilibrium transport conditions, electron-phonon interactions can affect the coupled transport of electrons and phonons in the bulk through the "phonon/electron drag" mechanism as well as the interfacial thermal transport. Based on these recent results, we evaluate the potential use of electron-phonon interactions to control thermal transport in solids. We also provide an outlook on future directions of computational and experimental developments.

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“…4d, signaling strong Kohn anomalies. The same phonon softening effect was also found near a chemical-composition-induced topological phase transition in Hg1−xCdxTe [79].…”

Section: ⅲ2 Real Part Of the Phonon Self-energy: Phonon Frequency Ren...supporting

confidence: 69%

Section: ⅲ2 Real Part Of the Phonon Self-energy: Phonon Frequency Ren...mentioning

confidence: 90%

Impact of Electron-Phonon Interaction on Thermal Transport: A Review

Quan

Yue

Liao

2021

Nanoscale and Microscale Thermophysical Engineering

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“…Unlike a conventional Fermi liquid, in TaP, with 8 W1 nodes and 16 W2 nodes, numerous q regimes in the Brillouin zone can achieve Kohn anomalies. The recent ab initio calculations in Dirac semimetals also confirm the existence of Kohn anomalies in topological semimetals [39,40]. Moreover, in contrast to the conventional Fermi liquid with only static screening and logarithmic divergence dϵ r =dq ∝ lnðjq − 2k F j=4k F Þ, or graphene and 2D electron gas with ∂ϵ r =∂q ∝ 1= ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi ffi q 2 − 4k 2 F p , we find a highly distinct divergence condition at v F q 0 → AEν 0 with a leading term ∂ϵ r =∂q ∝ ðv F q 0 Þ 3 = ½ðv F q 0 Þ 2 − ν 02 , where dynamical effects play a critical role with explicit Weyl node location dependence and chirality selection.…”

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confidence: 68%

Topological Singularity Induced Chiral Kohn Anomaly in a Weyl Semimetal

et al. 2020

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The electron-phonon interaction (EPI) is instrumental in a wide variety of phenomena in solid-state physics, such as electrical resistivity in metals, carrier mobility, optical transition, and polaron effects in semiconductors, lifetime of hot carriers, transition temperature in BCS superconductors, and even spin relaxation in diamond nitrogen-vacancy centers for quantum information processing. However, due to the weak EPI strength, most phenomena have focused on electronic properties rather than on phonon properties. One prominent exception is the Kohn anomaly, where phonon softening can emerge when the phonon wave vector nests the Fermi surface of metals. Here we report a new class of Kohn anomaly in a topological Weyl semimetal (WSM), predicted by field-theoretical calculations, and experimentally observed through inelastic x-ray and neutron scattering on WSM tantalum phosphide. Compared to the conventional Kohn anomaly, the Fermi surface in a WSM exhibits multiple topological singularities of Weyl nodes, leading to a distinct nesting condition with chiral selection, a power-law divergence, and nonnegligible dynamical effects. Our work brings the concept of the Kohn anomaly into WSMs and sheds light on elucidating the EPI mechanism in emergent topological materials.

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“…While we investigate phonon-induced effects on the electronic properties of WSMs, it is also of significant interest to study electron-induced effects on phonon observables. For instance, recent works have addressed the Kohn anomaly [78][79][80] and quantum oscillations of the sound velocity [81,82] in WSMs. Future theoretical work could study such phenomena using the framework presented below.…”

Section: Introductionmentioning

confidence: 99%

Phonon-limited Transport and Fermi Arc Lifetime in Weyl Semimetals

Buccheri,

De Martino,

Pereira

et al. 2021

Preprint

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Phonon softening near topological phase transitions

Cited by 18 publications

References 66 publications

Impact of Electron-Phonon Interaction on Thermal Transport: A Review

Impact of Electron-Phonon Interaction on Thermal Transport: A Review

Topological Singularity Induced Chiral Kohn Anomaly in a Weyl Semimetal

Phonon-limited Transport and Fermi Arc Lifetime in Weyl Semimetals

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