Room-temperature chiral charge pumping in Dirac semimetals

Zhang, Cheng, Zhang, Enze, Wang, Weiyi, Liu, Yanwen, Chen, Zhi-Gang , Lu, Shiheng, Liang, Sihang, Cao, Junzhi, Yuan, Xiang, Tang, Lei, Li, Qian, Zhou, Chao, Gu, Teng, Wu, Yizheng, Zou, Jin and Xiu, Faxian (2017) Room-temperature chiral charge pumping in Dirac semimetals. Nature Communications, 8 13741. doi:10.1038/ncomms13741


Author Zhang, Cheng
Zhang, Enze
Wang, Weiyi
Liu, Yanwen
Chen, Zhi-Gang
Lu, Shiheng
Liang, Sihang
Cao, Junzhi
Yuan, Xiang
Tang, Lei
Li, Qian
Zhou, Chao
Gu, Teng
Wu, Yizheng
Zou, Jin
Xiu, Faxian
Title Room-temperature chiral charge pumping in Dirac semimetals
Journal name Nature Communications   Check publisher's open access policy
ISSN 2041-1723
Publication date 2017-01-09
Year available 2017
Sub-type Article (original research)
DOI 10.1038/ncomms13741
Open Access Status DOI
Volume 8
Start page 13741
Total pages 9
Place of publication London, United Kingdom
Publisher Nature Publishing Group
Language eng
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 Cd3As2. 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.
Formatted 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 Cd3As2. 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.
Keyword Multidisciplinary Sciences
Science & Technology - Other Topics
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID 61322407
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
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Centre for Microscopy and Microanalysis Publications
 
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