Limits of validity of the Rashba model in BiTeI: High-field magneto-optical study

S. Bordács, M. Orlita, M. Šikula, H. Murakawa, and Y. Tokura
Phys. Rev. B 100, 155203 – Published 9 October 2019

Abstract

It was recently shown that BiTeI, a semiconductor with polar crystal structure, possesses a giant spin splitting of electrons, which has been interpreted in terms of Rashba-type spin-orbit coupling. Here we use high field magneto-optical spectroscopy to quantify the deviations of the conduction-band profile from this appealing, but at the same time, strongly simplifying model. We find that the optical response—comprising a series of inter-Landau level excitations—can be described by the Rashba model only at low magnetic fields. In contrast, the high-field response appears to be more consistent with a simple picture of massless electrons in a conical band. This points towards more linear rather than parabolic dispersion at energies well above the bottom of the conduction band.

  • Figure
  • Figure
  • Figure
  • Received 13 July 2019

DOI:https://doi.org/10.1103/PhysRevB.100.155203

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

S. Bordács1,2, M. Orlita3,4, M. Šikula3, H. Murakawa5, and Y. Tokura6,7,8

  • 1Department of Physics, Budapest University of Technology and Economics, 1111 Budapest, Hungary
  • 2Hungarian Academy of Sciences, Premium Postdoctor Program, 1051 Budapest, Hungary
  • 3Laboratoire National des Champs Magnétiques Intenses, CNRS-UGA-UPS-INSA-EMFL, 25, avenue des Martyrs, 38042 Grenoble, France
  • 4Institute of Physics, Charles University, Ke Karlovu 5, 12116 Praha 2, Czech Republic
  • 5Department of Physics, Osaka University, Toyonaka 560-0043, Japan
  • 6RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
  • 7Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
  • 8Tokyo College, University of Tokyo, Tokyo 113-8656, Japan

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 100, Iss. 15 — 15 October 2019

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×