Specific features of the electronic, spin, and atomic structures of a topological insulator Bi2Te2.4Se0.6

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• 作者：M. V. Filyanina ; I. I. Klimovskikh ; S. V. Eremeev…
• 刊名：Physics of the Solid State
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：58
• 期：4
• 页码：779-787
• 全文大小：1,219 KB
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Solid State Physics and Spectroscopy
  Russian Library of Science
  
• 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
• ISSN：1090-6460
• 卷排序：58

文摘

The specific features of the electronic and spin structures of a triple topological insulator Bi₂Te_2.4Se_0.6, which is characterized by high-efficiency thermoelectric properties, have been studied with the use of angular- and spin-resolved photoelectron spectroscopy and compared with theoretical calculations in the framework of the density functional theory. It has been shown that the Fermi level for Bi₂Te_2.4Se_0.6 falls outside the band gap and traverses the topological surface state (the Dirac cone). Theoretical calculations of the electronic structure of the surface have demonstrated that the character of distribution of Se atoms on the Te–Se sublattice practically does not influence the dispersion of the surface topological electronic state. The spin structure of this state is characterized by helical spin polarization. Analysis of the Bi₂Te_2.4Se_0.6 surface by scanning tunnel microscopy has revealed atomic smoothness of the surface of a sample cleaved in an ultrahigh vacuum, with a lattice constant of ~4.23 Å. Stability of the Dirac cone of the Bi₂Te_2.4Se_0.6 compound to deposition of a Pt monolayer on the surface is shown.Original Russian Text © M.V. Filyanina, I.I. Klimovskikh, S.V. Eremeev, A.A. Rybkina, A.G. Rybkin, E.V. Zhizhin, A.E. Petukhov, I.P. Rusinov, K.A. Kokh, E.V. Chulkov, O.E. Tereshchenko, A.M. Shikin, 2016, published in Fizika Tverdogo Tela, 2016, Vol. 58, No. 4, pp. 754–762.