Determination of the energy band gap of Bi2Se3

• Authors: MARTINEZ G.; PIOT B.; HAKL M.A.; POTEMSKI M.; HOR Y. S.; MATERNA A.; STRZELECKA S. G.; HUBAN A.; CAHA Ondřej; NOVÁK Jiří; DUBROKA Adam; DRAŠAR C.; ORLITA M.
• Year of publication: 2017
• Type: Article in Periodical
• Magazine / Source: Scientific reports
• MU Faculty or unit: Faculty of Science
• web: https://www.nature.com/articles/s41598-017-07211-x.pdf
• Doi: https://doi.org/10.1038/s41598-017-07211-x
• Field: Solid matter physics and magnetism
• Keywords: energy band gap; topological insulator; magneto-transport; photoluminescence; infrared transmission
• Description: 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.

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