Violation of Ohm's law in a Weyl metal
SCIE
SCOPUS
- Title
- Violation of Ohm's law in a Weyl metal
- Authors
- Shin, Dongwoo; Lee, Yongwoo; Sasaki, M.; Jeong, Yoon Hee; Weickert, Franziska; Betts, Jon B.; Kim, Heon-Jung; Kim, Ki-Seok; Kim, Jeehoon
- Date Issued
- 2017-11
- Publisher
- NATURE PUBLISHING GROUP
- Abstract
- Ohm's law is a fundamental paradigm in the electrical transport of metals(1). Any transport signatures violating Ohm's law would give an indisputable fingerprint for a novel metallic state. Here, we uncover the breakdown of Ohm's law owing to a topological structure of the chiral anomaly in the Weyl metal phase. We observe nonlinear I-V characteristics in Bi0.96Sb0.04 single crystals in the diffusive limit, which occurs only for a magnetic-field-aligned electric field (E||B). The Boltzmann transport theory with the charge pumping effect reveals the topological-in-origin nonlinear conductivity, and it leads to a universal scaling function of the longitudinal magnetoconductivity, which completely describes our experimental results. As a hallmark of Weyl metals, the nonlinear conductivity provides a venue for nonlinear electronics, optical applications, and the development of a topological Fermi-liquid theory beyond the Landau Fermi-liquid theory.
- Keywords
- DIRAC SEMIMETAL CD3AS2; NEGATIVE MAGNETORESISTANCE
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/50470
- DOI
- 10.1038/NMAT4965
- ISSN
- 1476-1122
- Article Type
- Article
- Citation
- NATURE MATERIALS, vol. 16, no. 11, page. 1096 - +, 2017-11
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