The discovery of dynamic chiral anomaly in a Weyl semimetal NbAs

Xiang Yuan, Cheng Zhang, Yi Zhang, Zhongbo Yan, Tairu Lyu, Mengyao Zhang, Zhilin Li, Chaoyu Song, Minhao Zhao, Pengliang Leng, Mykhaylo Ozerov, Xiaolong Chen, Nanlin Wang, Yi Shi (), Hugen Yan () and Faxian Xiu ()
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Xiang Yuan: Fudan University
Cheng Zhang: Fudan University
Yi Zhang: Cornell University
Zhongbo Yan: Sun Yat-sen University
Tairu Lyu: University of California at Berkeley
Mengyao Zhang: Peking University
Zhilin Li: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
Chaoyu Song: Fudan University
Minhao Zhao: Fudan University
Pengliang Leng: Fudan University
Mykhaylo Ozerov: National High Magnetic Field Laboratory, Florida State University
Xiaolong Chen: Collaborative Innovation Center of Quantum Matter
Nanlin Wang: Peking University
Yi Shi: Nanjing University
Hugen Yan: Fudan University
Faxian Xiu: Fudan University

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract The experimental discovery of Weyl semimetals offers unprecedented opportunities to study Weyl physics in condensed matters. Unique electromagnetic response of Weyl semimetals such as chiral magnetic effect has been observed and presented by the axial θ E · B term in electromagnetic Lagrangian (E and B are the electric and magnetic field, respectively). But till now, the experimental progress in this direction in Weyl semimetals is restricted to the DC regime. Here we report experimental access to the dynamic regime in Weyl semimetal NbAs by combining the internal deformation potential of coupled phonons with applied static magnetic field. While the dynamic E · B field is realized, it produces an anomalous phonon activity with a characteristic angle-dependence. Our results provide an effective approach to achieve the dynamic regime beyond the widely-investigated DC limit which enables the coupling between the Weyl fermions and the electromagnetic wave for further study of novel light-matter interactions in Weyl semimetals.

Date: 2020
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DOI: 10.1038/s41467-020-14749-4

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