Geometric and electronic structure of the cs-doped Bi2Se3(0001) surface

M. M. Otrokov, A. Ernst, K. Mohseni, H. Fulara, S. Roy, G. R. Castro, J. Rubio-Zuazo, A. G. Ryabishchenkova, K. A. Kokh, O. E. Tereshchenko, Z. S. Aliev, M. B. Babanly, E. V. Chulkov, H. L. Meyerheim, S. S.P. Parkin

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Using surface x-ray diffraction and scanning tunneling microscopy in combination with first-principles calculations, we have studied the geometric and electronic structure of Cs-deposited Bi2Se3(0001) surface kept at room temperature. Two samples were investigated: a single Bi2Se3 crystal, whose surface was Ar sputtered and then annealed at ∼500C for several minutes prior to Cs deposition, and a 13-nm-thick epitaxial Bi2Se3 film that was not subject to sputtering and was annealed only at ∼350C. In the first case, a considerable fraction of Cs atoms occupy top layer Se atoms sites both on the terraces and along the upper step edges where they form one-dimensional-like structures parallel to the step. In the second case, Cs atoms occupy the fcc hollow site positions. First-principles calculations reveal that Cs atoms prefer to occupy Se positions on the Bi2Se3(0001) surface only if vacancies are present, which might be created during the crystal growth or during the surface preparation process. Otherwise, Cs atoms prefer to be located in fcc hollow sites in agreement with the experimental finding for the MBE-grown sample.

Original languageEnglish
Article number205429
Number of pages9
JournalPhysical Review B
Volume95
Issue number20
DOIs
Publication statusPublished - 22 May 2017

Keywords

  • SINGLE DIRAC CONE
  • TOPOLOGICAL INSULATORS
  • AB-INITIO
  • INTERFACE
  • BI2TE3
  • GROWTH
  • STATE

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