Room-temperature chiral charge pumping in Dirac semimetals

Zhang, Cheng and Zhang, Enze and Wang, Weiyi and Liu, Yanwen and Chen, Zhi-Gang and Lu, Shiheng and Liang, Sihang and Cao, Junzhi and Yuan, Xiang and Tang, Lei and Li, Qian and Zhou, Chao and Gu, Teng and Wu, Yizheng and Zou, Jin and Xiu, Faxian (2017) Room-temperature chiral charge pumping in Dirac semimetals. Nature Communications, 8.

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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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version made available under Creative Commons Attribution License 4.0
Faculty / Department / School: No Faculty
Date Deposited: 22 Jun 2017 00:01
Last Modified: 18 Apr 2018 03:58
Fields of Research : 03 Chemical Sciences > 0303 Macromolecular and Materials Chemistry > 030399 Macromolecular and Materials Chemistry not elsewhere classified
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970103 Expanding Knowledge in the Chemical Sciences
Identification Number or DOI: 10.1038/ncomms13741
URI: http://eprints.usq.edu.au/id/eprint/31660

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