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Real-space imaging and control of chiral anomaly induced current at room temperature in topological Dirac semimetal

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Title
Real-space imaging and control of chiral anomaly induced current at room temperature in topological Dirac semimetal
Author(s)
Park, Byung Cheol; Taewoo Ha; Kyung Ik Sim; Jung, Taek Sun; Kim, Jae Hoon; Kim, Yeongkwan; Lee, Young Hee; Kim, Teun-Teun; Sung Wng Kim
Publication Date
2022-11
Journal
Science Advances, v.8, no.47
Publisher
American Association for the Advancement of Science
Abstract
© 2022 American Association for the Advancement of Science. All rights reserved.Chiral fermions (CFs) in condensed matters, distinguished by right (+) or left (−) handedness, hold a promise for emergent quantum devices. Although a chiral anomaly induced current, Jchiral = J(+) − J(−), occurs in Weyl semimetals due to the charge imbalance of the CFs, monitoring spatial flow and temporal dynamics of Jchiral has not been demonstrated yet. Here, we report real-space imaging and control of Jchiral on the topological Dirac semimetal KZnBi at room temperature (RT) by near-field terahertz (THz) spectroscopy, establishing a relation for an electromagnetic control of Jchiral. In THz electric and external magnetic fields, we visualize a spatial flow of coherent Jchiral in macroscopic length scale and monitor its temporal dynamics in picosecond time scale, revealing its ultralong transport length around 100 micrometers. Such coherent Jchiral is further found to be controlled according to field directions, suggesting the feasibility of information science with topological Dirac semimetals at RT.
URI
https://pr.ibs.re.kr/handle/8788114/12550
DOI
10.1126/sciadv.abq2479
ISSN
2375-2548
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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