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 excitatio...

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Bibliographic Details
Published in:Applied physics letters 2015-12, Vol.107 (25)
Main Authors: Kellner, Jens, Liebmann, Marcus, Morgenstern, Markus, Eschbach, Markus, Młyńczak, Ewa, Plucinski, Lukasz, Schneider, Claus M., Kampmeier, Jörn, Lanius, Martin, Mussler, Gregor, Holländer, Bernhard, Grützmacher, Detlev
Format: Article
Language:English
Subjects:
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
EXCITATION
FERMI LEVEL
MOLECULAR BEAM EPITAXY
PHOTOELECTRON SPECTROSCOPY
PHOTOEMISSION
SUPERCONDUCTORS
THIN FILMS
TOPOLOGY
TUNING
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Summary: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4938394