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}

Journal Article · Mon Dec 21 00:00:00 EST 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4938394· OSTI ID:22486264

Kellner, Jens; Liebmann, Marcus; Morgenstern, Markus ^[1]; Eschbach, Markus; Młyńczak, Ewa; Plucinski, Lukasz; Schneider, Claus M. ^[2]; Kampmeier, Jörn; Lanius, Martin; Mussler, Gregor; Holländer, Bernhard; Grützmacher, Detlev ^[3]

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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)

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.

• OSTI ID: 22486264
• Journal Information: Applied Physics Letters, Vol. 107, Issue 25; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
EXCITATION
FERMI LEVEL
MOLECULAR BEAM EPITAXY
PHOTOELECTRON SPECTROSCOPY
PHOTOEMISSION
SUPERCONDUCTORS
THIN FILMS
TOPOLOGY
TUNING