Interplay between disorder and inversion symmetry: Extreme enhancement of the mobility near the Weyl point in BiTeI

M. Sasaki, Kyoung-Min Kim, A. Ohnishi, M. Kitaura, N. Tomita, V. A. Kulbachinskii, Ki-Seok Kim, and Heon-Jung Kim
Phys. Rev. B 92, 205121 – Published 20 November 2015

Abstract

We show experimental and theoretical evidence that BiTeI hosts a disordered metallic state named diffusive helical Fermi liquid, characterized by a pair of concentric spin-chiral Fermi surfaces with negligible intervalley scattering. Key experimental observations are extreme disparity of the mobility between inner and outer helical Fermi surfaces near the Weyl point and existence of the so-called universal scaling behavior for the Hall resistivity. Although the extreme enhancement of the inner-Fermi-surface mobility near the Weyl point is quantitatively explained within the self-consistent Born approximation, the existence of universal scaling in the Hall resistivity shows its breakdown, implying necessity of mass renormalization in the inner Fermi-surface beyond the independent electron picture.

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  • Received 9 February 2015
  • Revised 2 November 2015

DOI:https://doi.org/10.1103/PhysRevB.92.205121

©2015 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

M. Sasaki1,*, Kyoung-Min Kim2,*, A. Ohnishi1, M. Kitaura1, N. Tomita1, V. A. Kulbachinskii3, Ki-Seok Kim2, and Heon-Jung Kim4,†

  • 1Faculty of Science, Yamagata University, Kojirakawa, Yamagata 990-8560, Japan
  • 2Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk 790-784, Republic of Korea
  • 3Physics Department, Moscow State University, Moscow 119899, Russia
  • 4Department of Physics, College of Natural Science, Daegu University, Gyeongbuk 712-714, Republic of Korea

  • *Both authors equally contribute to the present paper.
  • hjkim76@daegu.ac.kr

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Vol. 92, Iss. 20 — 15 November 2015

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