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Title: In-surface confinement of topological insulator nanowire surface states

The bandstructures of [110] and [001] Bi{sub 2}Te{sub 3} nanowires are solved with the atomistic 20 band tight binding functionality of NEMO5. The theoretical results reveal: The popular assumption that all topological insulator (TI) wire surfaces are equivalent is inappropriate. The Fermi velocity of chemically distinct wire surfaces differs significantly which creates an effective in-surface confinement potential. As a result, topological insulator surface states prefer specific surfaces. Therefore, experiments have to be designed carefully not to probe surfaces unfavorable to the surface states (low density of states) and thereby be insensitive to the TI-effects.
Authors:
 [1] ;  [2] ;  [3] ;  [2] ;  [4] ;  [2] ;  [1] ;  [2] ;  [2] ;  [2] ;  [4] ;  [2] ;  [2] ;  [1] ;  [2] ;  [2] ;  [4]
  1. Department of Physics and Astronomy, Purdue, West Lafayette, Indiana 47907 (United States)
  2. (United States)
  3. School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907 (United States)
  4. Network for Computational Nanotechnology, Purdue, West Lafayette, Indiana 47907 (United States)
Publication Date:
OSTI Identifier:
22482118
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 12; 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; BISMUTH TELLURIDES; DENSITY OF STATES; DESIGN; NANOWIRES; POTENTIALS; SURFACES