Effect of Sb substitution on the topological surface states in Bi2Se3 single crystals: A magneto-transport study

T. R. Devidas, E. P. Amaladass, Shilpam Sharma, Awadhesh Mani, R. Rajaraman, C. S. Sundar, A. Bharathi

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Magneto-transport measurements have been carried out on Bi2-xSbxSe3 (x = 0,0.05, 0.1,0.3,0.5) single crystals at 4.2 K temperature in the magnetic field range of - 15 T to 15 T. Shubnikov-de Haas (SdH) oscillations of 2D nature were observed in samples with Sb concentration upto x = 0.3. The analyses of SdH oscillations observed in magneto-resistance data using Lifshitz-Kosevich equation reveal a systematic decrease in the Fermi surface area with Sb substitution. The Berry phase obtained from the Landau level fan diagram suggests the occurrence of 2D oscillations arising from a topological surface state (TSS) for Sb concentrations of x = 0,0.05 and 0.1; while 2D oscillation seen at higher Sb concentration is attributed to surface 2D electron gas consequent to downward band bending.

Original languageEnglish
Article number026101
JournalMaterials Research Express
Volume4
Issue number2
DOIs
StatePublished - Feb 2017
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2017 IOP Publishing Ltd.

Keywords

  • Band bending
  • Magneto-transport
  • Shubnikov de Haas oscillations
  • Topological insulators

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