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  Giant Magnetic Quantum Oscillations in the Thermal Conductivity of TaAs: Indications of Chiral Zero Sound

Xiang, J., Hu, S., Song, Z., Lv, M., Zhang, J., Zhao, L., et al. (2019). Giant Magnetic Quantum Oscillations in the Thermal Conductivity of TaAs: Indications of Chiral Zero Sound. Physical Review X, 9(3): 031036, pp. 1-8. doi:10.1103/PhysRevX.9.031036.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-ABBA-A Version Permalink: http://hdl.handle.net/21.11116/0000-0004-ABBC-8
Genre: Journal Article

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 Creators:
Xiang, Junsen1, Author
Hu, Sile1, Author
Song, Zhida1, Author
Lv, Meng1, Author
Zhang, Jiahao1, Author
Zhao, Lingxiao1, Author
Li, Wei1, Author
Chen, Ziyu1, Author
Zhang, Shuai1, Author
Wang, Jian-Tao1, Author
Yang, Yi-feng1, Author
Dai, Xi1, Author
Steglich, Frank2, Author              
Chen, Genfu1, Author
Sun, Peijie1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863467              

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 Abstract: Charge transport of topological semimetals is the focus of intensive investigations because of their nontrivial band topology. Heat transport of these materials, on the other hand, is largely unexplored and remains elusive. Here, we report on an observation of unprecedented, giant magnetic quantum oscillations of thermal conductivity in the prototypical Weyl semimetal TaAs. The oscillations are antiphase with the quantum oscillating electronic density of states of a Weyl pocket, and their amplitudes amount to 2 orders of magnitude of the estimation based on the Wiedemann-Franz law. Our analyses show that all the conventional heat-transport mechanisms through diffusions of propagating electrons, phonons, and electron-hole bipolar excitations are far inadequate to account for these phenomena. Taking further experimental facts that the parallel field configuration favors much-higher magnetothermal conductivity, we propose that the newly proposed chiral zero sound provides a reasonable explanation to these exotic phenomena. More work focusing on other topological semimetals along the same line is badly called for.

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Language(s): eng - English
 Dates: 2019-08-282019-08-28
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 000482947100001
DOI: 10.1103/PhysRevX.9.031036
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Title: Physical Review X
  Abbreviation : Phys. Rev. X
Source Genre: Journal
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Publ. Info: New York, NY : American Physical Society
Pages: - Volume / Issue: 9 (3) Sequence Number: 031036 Start / End Page: 1 - 8 Identifier: Other: 2160-3308
CoNE: https://pure.mpg.de/cone/journals/resource/2160-3308