Anomalously Suppressed Thermal Conduction by Electron-Phonon Coupling in Charge-Density-Wave Tantalum Disulfide

Advanced Science
Huili LiuJunqiao Wu

Abstract

Charge and thermal transport in a crystal is carried by free electrons and phonons (quantized lattice vibration), the two most fundamental quasiparticles. Above the Debye temperature of the crystal, phonon-mediated thermal conductivity (κL) is typically limited by mutual scattering of phonons, which results in κL decreasing with inverse temperature, whereas free electrons play a negligible role in κL. Here, an unusual case in charge-density-wave tantalum disulfide (1T-TaS2) is reported, in which κL is limited instead by phonon scattering with free electrons, resulting in a temperature-independent κL. In this system, the conventional phonon-phonon scattering is alleviated by its uniquely structured phonon dispersions, while unusually strong electron-phonon (e-ph) coupling arises from its Fermi surface strongly nested at wavevectors in which phonons exhibit Kohn anomalies. The unusual temperature dependence of thermal conduction is found as a consequence of these effects. The finding reveals new physics of thermal conduction, offers a unique platform to probe e-ph interactions, and provides potential ways to control heat flow in materials with free charge carriers. The temperature-independent thermal conductivity may also find th...Continue Reading

References

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Citations

Mar 6, 2021·Physical Chemistry Chemical Physics : PCCP·Shouhang LiHua Bao
Aug 28, 2021·Materials·Hojoon YiSeong Chu Lim

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Methods Mentioned

BETA
neutron scattering
atomic force microscopy
scanning electron microscopy
AFM

Software Mentioned

EPW
Quantum Espresso ( QE ) package
QE
XCrySDen
WANNIER90
D3Q

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