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Momentum-resolved Landau-level spectroscopy of Dirac surface state in Bi2Se3

T. Hanaguri, K. Igarashi, M. Kawamura, H. Takagi, and T. Sasagawa
Phys. Rev. B 82, 081305(R) – Published 9 August 2010
Physics logo See Viewpoint: Quantized topological surface states promise a quantum Hall state in topological insulators

Abstract

We investigate Dirac fermions on the surface of the topological insulator Bi2Se3 using scanning tunneling spectroscopy. Landau levels (LLs) are observed in the tunneling spectra in a magnetic field. In contrast to LLs of conventional electrons, a field-independent LL appears at the Dirac point, which is a hallmark of Dirac fermions. A scaling analysis of LLs based on the Bohr-Sommerfeld quantization condition allowed us to determine the dispersion of the surface band. Near the Fermi energy, fine peaks mixed with LLs appear in the spectra, which may be responsible for the anomalous magnetofingerprint effect [J. G. Checkelsky et al., Phys. Rev. Lett. 103, 246601 (2009)].

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  • Received 28 February 2010

DOI:https://doi.org/10.1103/PhysRevB.82.081305

©2010 American Physical Society

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Quantized topological surface states promise a quantum Hall state in topological insulators

Published 9 August 2010

The first experimental observation of Landau levels in the surface states of a three-dimensional topological insulator confirms the levels obey unconventional quantization rules.

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Authors & Affiliations

T. Hanaguri1, K. Igarashi2, M. Kawamura1, H. Takagi1,3, and T. Sasagawa2

  • 1RIKEN Advanced Science Institute, Wako, Saitama 351-0198, Japan
  • 2Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama, Kanagawa 226-8503, Japan
  • 3Department of Advanced Materials, University of Tokyo, Kashiwa, Chiba 277-8561, Japan

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Issue

Vol. 82, Iss. 8 — 15 August 2010

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