Temperature-tunable Fano resonance induced by strong coupling between Weyl fermions and phonons in TaAs

Xu, Bing; Dai, Yaomin M.; Zhao, Lingxiao X.; Wang, Kai; Yang, Run; Zhang, Wei; Liu, Jinyun Y.; Xiao, Hong; Chen, G. F.; Trugman, Stuart Alan; Zhu, Jianxin; Taylor, Antoinette Jane; Yarotski, Dmitry Anatolievitch; Prasankumar, Rohit Prativadi; Qiu, Xiang Gang

doi:10.1038/ncomms14933

Title: Temperature-tunable Fano resonance induced by strong coupling between Weyl fermions and phonons in TaAs

Journal Article · Thu Mar 30 00:00:00 EDT 2017 · Nature Communications

DOI:https://doi.org/10.1038/ncomms14933· OSTI ID:1357119

Xu, Bing ^[1]; Dai, Yaomin M. ^[2]; Zhao, Lingxiao X. ^[3]; Wang, Kai ^[3]; Yang, Run ^[3]; Zhang, Wei ^[3]; Liu, Jinyun Y. ^[3]; Xiao, Hong ^[4]; Chen, G. F. ^[5]; Trugman, Stuart Alan ^[6]; Zhu, Jianxin ^[6]; Taylor, Antoinette Jane ^[7]; Yarotski, Dmitry Anatolievitch ^[2]; Prasankumar, Rohit Prativadi ^[2]; Qiu, Xiang Gang ^[5]

Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics; Center for High Pressure Science and Technology Advanced Research, Beijing (China)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Center for Integrated Nanotechnologies
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics
Center for High Pressure Science and Technology Advanced Research, Beijing (China)
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics; Collaborative Innovation Center of Quantum Matter, Beijing (China)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Center for Integrated Nanotechnologies and Theoretical Division
Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Associate Directorate for Chemistry, Life, and Earth Sciences

Strong coupling between discrete phonon and continuous electron–hole pair excitations can induce a pronounced asymmetry in the phonon line shape, known as the Fano resonance. This effect has been observed in various systems. We reveal explicit evidence for strong coupling between an infrared-active phonon and electronic transitions near the Weyl points through the observation of a Fano resonance in the Weyl semimetal TaAs. The resulting asymmetry in the phonon line shape, conspicuous at low temperatures, diminishes continuously with increasing temperature. Furthermore, this behaviour originates from the suppression of electronic transitions near the Weyl points due to the decreasing occupation of electronic states below the Fermi level (EF) with increasing temperature, as well as Pauli blocking caused by thermally excited electrons above EF. These findings not only elucidate the mechanism governing the tunable Fano resonance but also open a route for exploring exotic physical phenomena through phonon properties in Weyl semimetals.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1357119

Report Number(s):: LA-UR-16-26540

Journal Information:: Nature Communications, Vol. 8; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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