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Title: Violation of Ohm’s law in a Weyl metal [A hallmark of the Weyl metal state: Breakdown of Ohm's law]

Ohm’s law is a fundamental paradigm in the electrical transport of metals. 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 Bi 0.96Sb 0.04 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. Furthermore, 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.
Authors:
 [1] ;  [2] ;  [3] ;  [2] ; ORCiD logo [4] ; ORCiD logo [5] ;  [6] ;  [2] ; ORCiD logo [1]
  1. Pohang Univ. of Science and Technology (POSTECH), Pohang (Republic of Korea); Institute for Basic Science (IBS), Pohang (Republic of Korea)
  2. Pohang Univ. of Science and Technology (POSTECH), Pohang (Republic of Korea)
  3. Yamagata Univ., Yamagata (Japan)
  4. Florida State Univ., Tallahassee, FL (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  6. Daegu Univ., Gyeonbuk (Korea)
Publication Date:
Report Number(s):
LA-UR-17-22745
Journal ID: ISSN 1476-1122
Grant/Contract Number:
AC52-06NA25396; IBS-R014-D1; DMR-1157490
Type:
Accepted Manuscript
Journal Name:
Nature Materials
Additional Journal Information:
Journal Volume: 16; Journal ID: ISSN 1476-1122
Publisher:
Nature Publishing Group
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
National Science Foundation (NSF); USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1398920