When Chiral Photons Meet Chiral Fermions: Photoinduced Anomalous Hall Effects in Weyl Semimetals

Physical Review Letters
Ching-Kit ChanYing Ran

Abstract

The Weyl semimetal is characterized by three-dimensional linear band touching points called Weyl nodes. These nodes come in pairs with opposite chiralities. We show that the coupling of circularly polarized photons with these chiral electrons generates a Hall conductivity without any applied magnetic field in the plane orthogonal to the light propagation. This phenomenon comes about because with all three Pauli matrices exhausted to form the three-dimensional linear dispersion, the Weyl nodes cannot be gapped. Rather, the net influence of chiral photons is to shift the positions of the Weyl nodes. Interestingly, the momentum shift is tightly correlated with the chirality of the node to produce a net anomalous Hall signal. Application of our proposal to the recently discovered TaAs family of Weyl semimetals leads to an order-of-magnitude estimate of the photoinduced Hall conductivity which is within the experimentally accessible range.

References

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Citations

Jun 9, 2016·Physical Chemistry Chemical Physics : PCCP·Tao OuyangJianxin Zhong
May 4, 2018·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Tongyun HuangLi-Gang Wang
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Mar 19, 2016·Physical Review Letters·Su-Yang XuM Zahid Hasan
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Jul 6, 2018·Scientific Reports·S A Owerre
Nov 13, 2018·Nature Physics·Enke LiuClaudia Felser
Nov 24, 2018·Physical Review Letters·Xiao-Qi SunShanhui Fan
Mar 29, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Yao-Ming DongJing Wang
May 15, 2020·Optics Express·Shuoqing LiuZhaoming Luo
Jan 18, 2017·Nature Communications·Hannes HübenerAngel Rubio
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Mar 6, 2019·Nature Materials·Junchao MaDong Sun
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May 30, 2020·Physical Review Letters·Mark MaceSayantan Sharma
Jul 8, 2020·Nature Materials·Jing LiuDong Sun
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Mar 27, 2021·Nature Communications·Meng-Xue GuanSheng Meng
Apr 16, 2021·Scientific Reports·Iraj Abbasian ShojaeiLeigh M Smith
May 19, 2021·Proceedings of the National Academy of Sciences of the United States of America·Yang Zhang, Liang Fu

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