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Title: Electronic structure of a superconducting topological insulator Sr-doped Bi{sub 2}Se{sub 3}

Using high-resolution angle-resolved photoemission spectroscopy and scanning tunneling microscopy/spectroscopy, the atomic and low energy electronic structure of the Sr-doped superconducting topological insulators (Sr{sub x}Bi{sub 2}Se{sub 3}) was studied. Scanning tunneling microscopy shows that most of the Sr atoms are not in the van der Waals gap. After Sr doping, the Fermi level was found to move further upwards when compared with the parent compound Bi{sub 2}Se{sub 3}, which is consistent with the low carrier density in this system. The topological surface state was clearly observed, and the position of the Dirac point was determined in all doped samples. The surface state is well separated from the bulk conduction bands in the momentum space. The persistence of separated topological surface state combined with small Fermi energy makes this superconducting material a very promising candidate for the time reversal invariant topological superconductor.
Authors:
; ; ;  [1] ; ; ; ;  [2] ; ; ; ;  [1] ;  [3] ;  [1] ;  [3] ;  [3]
  1. Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240 (China)
  2. Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Science, Shanghai 200050 (China)
  3. (China)
Publication Date:
OSTI Identifier:
22485961
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ATOMS; BISMUTH SELENIDES; CARRIER DENSITY; DOPED MATERIALS; ELECTRONIC STRUCTURE; FERMI LEVEL; PHOTOELECTRON SPECTROSCOPY; RESOLUTION; SCANNING TUNNELING MICROSCOPY; SUPERCONDUCTORS; VAN DER WAALS FORCES