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Hexagonally Deformed Fermi Surface of the 3D Topological Insulator Bi2Se3

K. Kuroda, M. Arita, K. Miyamoto, M. Ye, J. Jiang, A. Kimura, E. E. Krasovskii, E. V. Chulkov, H. Iwasawa, T. Okuda, K. Shimada, Y. Ueda, H. Namatame, and M. Taniguchi
Phys. Rev. Lett. 105, 076802 – Published 10 August 2010
Physics logo See Synopsis: A flattened cone

Abstract

A hexagonal deformation of the Fermi surface of Bi2Se3 has been for the first time observed by angle-resolved photoemission spectroscopy. This is in contrast to the general belief that Bi2Se3 possesses an ideal Dirac cone. The hexagonal shape is found to disappear near the Dirac node, which would protect the surface state electrons from backscattering. It is also demonstrated that the Fermi energy of naturally electron-doped Bi2Se3 can be tuned by 1% Mg doping in order to realize the quantum topological transport.

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  • Received 10 June 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.076802

© 2010 The American Physical Society

Synopsis

Key Image

A flattened cone

Published 16 August 2010

Photoemission measurements challenge the picture that the electronic states on the surface of the topological insulator Bi2Se3 form a perfect Dirac cone.

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Authors & Affiliations

K. Kuroda1, M. Arita2, K. Miyamoto2, M. Ye1, J. Jiang1, A. Kimura1,*, E. E. Krasovskii3,4,5, E. V. Chulkov3,4,6, H. Iwasawa2, T. Okuda2, K. Shimada2, Y. Ueda7, H. Namatame2, and M. Taniguchi1,†

  • 1Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan
  • 2Hiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-0046, Japan
  • 3Departamento de Física de Materiales, Facultad de Ciencias Químicas, Universidad del Pais Vasco/Euskal Herriko Unibertsitatea, Apartado 1072, 20080 San Sebastián/Donostia, Basque Country, Spain
  • 4Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 4, 20018 San Sebastián/Donostia, Basque Country, Spain
  • 5IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Spain
  • 6Centro de Física de Materiales CFM—Materials Physics Center MPC, Centro Mixto CSIC-UPV/EHU, Edificio Korta, Avenida de Tolosa 72, 20018 San Sebastián, Spain
  • 7Kure National College of Technology, Agaminami 2-2-11, Kure 737-8506, Japan

  • *akiok@hiroshima-u.ac.jp
  • Also at Hiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-0046, Japan.

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Issue

Vol. 105, Iss. 7 — 13 August 2010

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