Universität zu Köln

Muenning, Felix, Breunig, Oliver ORCID: 0000-0001-8651-1757, Legg, Henry F., Roitsch, Stefan, Fan, Dingxun ORCID: 0000-0003-3410-3393, Roessler, Matthias, Rosch, Achim ORCID: 0000-0002-6586-5721 and Ando, Yoichi ORCID: 0000-0002-3553-3355 (2021). Quantum confinement of the Dirac surface states in topological-insulator nanowires. Nat. Commun., 12 (1). BERLIN: NATURE RESEARCH. ISSN 2041-1723

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Abstract

The non-trivial topology of three-dimensional topological insulators dictates the appearance of gapless Dirac surface states. Intriguingly, when made into a nanowire, quantum confinement leads to a peculiar gapped Dirac sub-band structure. This gap is useful for, e.g., future Majorana qubits based on TIs. Furthermore, these sub-bands can be manipulated by a magnetic flux and are an ideal platform for generating stable Majorana zero modes, playing a key role in topological quantum computing. However, direct evidence for the Dirac sub-bands in TI nanowires has not been reported so far. Here, using devices fabricated from thin bulk-insulating (Bi1-xSbx)(2)Te-3 nanowires we show that non-equidistant resistance peaks, observed upon gate-tuning the chemical potential across the Dirac point, are the unique signatures of the quantized sub-bands. These TI nanowires open the way to address the topological mesoscopic physics, and eventually the Majorana physics when proximitized by an s-wave superconductor. In topological insulator nanowires quantized Dirac sub-bands are expected, but direct evidence is still missing. Here, the authors report signatures of sub-bands in the gate-voltage dependence of the resistance by tuning the chemical potential in (Bi1-xSbx)(2)Te-3 nanowires through the Dirac point.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Muenning, Felix UNSPECIFIED UNSPECIFIED UNSPECIFIED Breunig, Oliver UNSPECIFIED orcid.org/0000-0001-8651-1757 UNSPECIFIED Legg, Henry F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Roitsch, Stefan UNSPECIFIED UNSPECIFIED UNSPECIFIED Fan, Dingxun UNSPECIFIED orcid.org/0000-0003-3410-3393 UNSPECIFIED Roessler, Matthias UNSPECIFIED UNSPECIFIED UNSPECIFIED Rosch, Achim UNSPECIFIED orcid.org/0000-0002-6586-5721 UNSPECIFIED Ando, Yoichi UNSPECIFIED orcid.org/0000-0002-3553-3355 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-572829
DOI:	10.1038/s41467-021-21230-3
Journal or Publication Title:	Nat. Commun.
Volume:	12
Number:	1
Date:	2021
Publisher:	NATURE RESEARCH
Place of Publication:	BERLIN
ISSN:	2041-1723
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language Multidisciplinary Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/57282