Scientific Reports (Jul 2017)

Determination of the energy band gap of Bi2Se3

  • G. Martinez,
  • B. A. Piot,
  • M. Hakl,
  • M. Potemski,
  • Y. S. Hor,
  • A. Materna,
  • S. G. Strzelecka,
  • A. Hruban,
  • O. Caha,
  • J. Novák,
  • A. Dubroka,
  • Č. Drašar,
  • M. Orlita

DOI
https://doi.org/10.1038/s41598-017-07211-x
Journal volume & issue
Vol. 7, no. 1
pp. 1 – 5

Abstract

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Abstract Despite intensive investigations of Bi2Se3 in past few years, the size and nature of the bulk energy band gap of this well-known 3D topological insulator still remain unclear. Here we report on a combined magneto-transport, photoluminescence and infrared transmission study of Bi2Se3, which unambiguously shows that the energy band gap of this material is direct and reaches E g = (220 ± 5) meV at low temperatures.