Room-temperature chiral charge pumping in Dirac semimetals
Article
Article Title | Room-temperature chiral charge pumping in Dirac semimetals |
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ERA Journal ID | 122966 |
Article Category | Article |
Authors | Zhang, Cheng (Author), Zhang, Enze (Author), Wang, Weiyi (Author), Liu, Yanwen (Author), Chen, Zhi-Gang (Author), Lu, Shiheng (Author), Liang, Sihang (Author), Cao, Junzhi (Author), Yuan, Xiang (Author), Tang, Lei (Author), Li, Qian (Author), Zhou, Chao (Author), Gu, Teng (Author), Wu, Yizheng (Author), Zou, Jin (Author) and Xiu, Faxian (Author) |
Journal Title | Nature Communications |
Journal Citation | 8 |
Number of Pages | 8 |
Year | 2017 |
Publisher | Nature Publishing Group |
Place of Publication | United Kingdom |
ISSN | 2041-1723 |
Digital Object Identifier (DOI) | https://doi.org/10.1038/ncomms13741 |
Web Address (URL) | http://www.nature.com/articles/ncomms13741.pdf |
Abstract | Chiral anomaly, a non-conservation of chiral charge pumped by the topological nontrivial gauge fields, has been predicted to exist in Weyl semimetals. However, until now, the experimental signature of this effect exclusively relies on the observation of negative longitudinal magnetoresistance at low temperatures. Here, we report the field-modulated chiral charge pumping process and valley diffusion in Cd 3 As 2. Apart from the conventional negative magnetoresistance, we observe an unusual nonlocal response with negative field dependence up to room temperature, originating from the diffusion of valley polarization. Furthermore, a large magneto-optic Kerr effect generated by parallel electric and magnetic fields is detected. These new experimental approaches provide a quantitative analysis of the chiral anomaly phenomenon which was inaccessible previously. The ability to manipulate the valley polarization in topological semimetal at room temperature opens up a route towards understanding its fundamental properties and utilizing the chiral fermions. |
ANZSRC Field of Research 2020 | 340399. Macromolecular and materials chemistry not elsewhere classified |
Byline Affiliations | Fudan University, China |
University of Queensland | |
Zhejiang A & F University, China | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q4143/room-temperature-chiral-charge-pumping-in-dirac-semimetals
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