Temperature-tunable Fano resonance induced by strong coupling between Weyl fermions and phonons in TaAs
Abstract
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.
- Authors:
-
- 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
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1357119
- Report Number(s):
- LA-UR-16-26540
Journal ID: ISSN 2041-1723
- Grant/Contract Number:
- AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Volume: 8; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Material Science; Fano resonance, Weyl semimetals
Citation Formats
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, and Qiu, Xiang Gang. Temperature-tunable Fano resonance induced by strong coupling between Weyl fermions and phonons in TaAs. United States: N. p., 2017.
Web. doi:10.1038/ncomms14933.
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. Temperature-tunable Fano resonance induced by strong coupling between Weyl fermions and phonons in TaAs. United States. https://doi.org/10.1038/ncomms14933
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, and Qiu, Xiang Gang. Thu .
"Temperature-tunable Fano resonance induced by strong coupling between Weyl fermions and phonons in TaAs". United States. https://doi.org/10.1038/ncomms14933. https://www.osti.gov/servlets/purl/1357119.
@article{osti_1357119,
title = {Temperature-tunable Fano resonance induced by strong coupling between Weyl fermions and phonons in TaAs},
author = {Xu, Bing and Dai, Yaomin M. and Zhao, Lingxiao X. and Wang, Kai and Yang, Run and Zhang, Wei and Liu, Jinyun Y. and Xiao, Hong and Chen, G. F. and Trugman, Stuart Alan and Zhu, Jianxin and Taylor, Antoinette Jane and Yarotski, Dmitry Anatolievitch and Prasankumar, Rohit Prativadi and Qiu, Xiang Gang},
abstractNote = {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.},
doi = {10.1038/ncomms14933},
journal = {Nature Communications},
number = ,
volume = 8,
place = {United States},
year = {Thu Mar 30 00:00:00 EDT 2017},
month = {Thu Mar 30 00:00:00 EDT 2017}
}
Web of Science
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