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Title: Chiral terahertz wave emission from the Weyl semimetal TaAs

Abstract

Weyl semimetals host chiral fermions with distinct chiralities and spin textures. Optical excitations involving those chiral fermions can induce exotic carrier responses, and in turn lead to novel optical phenomena. Here, we discover strong coherent terahertz emission from Weyl semimetal TaAs, which is demonstrated as a unique broadband source of the chiral terahertz wave. The polarization control of the THz emission is achieved by tuning photoexcitation of ultrafast photocurrents via the photogalvanic effect. In the near-infrared regime, the photon-energy dependent nonthermal current due to the predominant circular photogalvanic effect can be attributed to the radical change of the band velocities when the chiral Weyl fermions are excited during selective optical transitions between the tilted anisotropic Weyl cones and the massive bulk bands. Our findings provide a design concept for creating chiral photon sources using quantum materials and open up new opportunities for developing ultrafast opto-electronics using Weyl physics.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [2];  [3];  [1];  [1];  [1];  [1];  [2]; ORCiD logo [4]; ORCiD logo [5];  [2]; ORCiD logo [1]
  1. Univ. of Electronic Science and Technology of China, Chengdu (China)
  2. Stony Brook Univ., NY (United States). Dept. of Physics and Astronomy
  3. Peking Univ., Beijing (China); Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics (BNLCP-CAS)
  4. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics (BNLCP-CAS); Songshan Lake Materials Lab., Dongguan (China)
  5. Stony Brook Univ., NY (United States). Dept. of Physics and Astronomy; Brookhaven National Lab. (BNL), Upton, NY (United States). Dept. of Physics
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
OSTI Identifier:
1606188
Report Number(s):
BNL-213750-2020-JAAM
Journal ID: ISSN 2041-1723
Grant/Contract Number:  
SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 11; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Gao, Y., Kaushik, S., Philip, E. J., Li, Z., Qin, Y., Liu, Y. P., Zhang, W. L., Su, Y. L., Chen, X., Weng, H., Kharzeev, D. E., Liu, M. K., and Qi, J. Chiral terahertz wave emission from the Weyl semimetal TaAs. United States: N. p., 2020. Web. https://doi.org/10.1038/s41467-020-14463-1.
Gao, Y., Kaushik, S., Philip, E. J., Li, Z., Qin, Y., Liu, Y. P., Zhang, W. L., Su, Y. L., Chen, X., Weng, H., Kharzeev, D. E., Liu, M. K., & Qi, J. Chiral terahertz wave emission from the Weyl semimetal TaAs. United States. https://doi.org/10.1038/s41467-020-14463-1
Gao, Y., Kaushik, S., Philip, E. J., Li, Z., Qin, Y., Liu, Y. P., Zhang, W. L., Su, Y. L., Chen, X., Weng, H., Kharzeev, D. E., Liu, M. K., and Qi, J. Wed . "Chiral terahertz wave emission from the Weyl semimetal TaAs". United States. https://doi.org/10.1038/s41467-020-14463-1. https://www.osti.gov/servlets/purl/1606188.
@article{osti_1606188,
title = {Chiral terahertz wave emission from the Weyl semimetal TaAs},
author = {Gao, Y. and Kaushik, S. and Philip, E. J. and Li, Z. and Qin, Y. and Liu, Y. P. and Zhang, W. L. and Su, Y. L. and Chen, X. and Weng, H. and Kharzeev, D. E. and Liu, M. K. and Qi, J.},
abstractNote = {Weyl semimetals host chiral fermions with distinct chiralities and spin textures. Optical excitations involving those chiral fermions can induce exotic carrier responses, and in turn lead to novel optical phenomena. Here, we discover strong coherent terahertz emission from Weyl semimetal TaAs, which is demonstrated as a unique broadband source of the chiral terahertz wave. The polarization control of the THz emission is achieved by tuning photoexcitation of ultrafast photocurrents via the photogalvanic effect. In the near-infrared regime, the photon-energy dependent nonthermal current due to the predominant circular photogalvanic effect can be attributed to the radical change of the band velocities when the chiral Weyl fermions are excited during selective optical transitions between the tilted anisotropic Weyl cones and the massive bulk bands. Our findings provide a design concept for creating chiral photon sources using quantum materials and open up new opportunities for developing ultrafast opto-electronics using Weyl physics.},
doi = {10.1038/s41467-020-14463-1},
journal = {Nature Communications},
number = 1,
volume = 11,
place = {United States},
year = {2020},
month = {2}
}

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