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Title: Tuning the Dirac point to the Fermi level in the ternary topological insulator (Bi{sub 1−x}Sb{sub x}){sub 2}Te{sub 3}

In order to stabilize Majorana excitations within vortices of proximity induced topological superconductors, it is mandatory that the Dirac point matches the Fermi level rather exactly, such that the conventionally confined states within the vortex are well separated from the Majorana-type excitation. Here, we show by angle resolved photoelectron spectroscopy that (Bi{sub 1−x}Sb{sub x}){sub 2}Te{sub 3} thin films with x = 0.94 prepared by molecular beam epitaxy and transferred in ultrahigh vacuum from the molecular beam epitaxy system to the photoemission setup match this condition. The Dirac point is within 10 meV around the Fermi level, and we do not observe any bulk bands intersecting the Fermi level.
Authors:
; ;  [1] ; ; ; ;  [2] ; ; ; ; ;  [3]
  1. II Institute of Physics B, RWTH Aachen University, Aachen 52074 (Germany)
  2. Peter Grünberg Institut (PGI-6), FZ Jülich GmbH, Jülich 52428 (Germany)
  3. Peter Grünberg Institut (PGI-9), FZ Jülich GmbH, Jülich 52428 (Germany)
Publication Date:
OSTI Identifier:
22486264
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 25; 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; EXCITATION; FERMI LEVEL; MOLECULAR BEAM EPITAXY; PHOTOELECTRON SPECTROSCOPY; PHOTOEMISSION; SUPERCONDUCTORS; THIN FILMS; TOPOLOGY; TUNING