Universität zu Köln

Wang, Jimin ORCID: 0000-0002-3871-4995, Kurzendorfer, Alexander, Chen, Lin ORCID: 0000-0002-8233-800X, Wang, Zhiwei, Ando, Yoichi ORCID: 0000-0002-3553-3355, Xu, Yang, Miotkowski, Ireneusz, Chen, Yong P. ORCID: 0000-0002-7356-4179 and Weiss, Dieter (2021). Mobility spectrum analysis on three-dimensional topological insulator BiSbTeSe2. Appl. Phys. Lett., 118 (25). MELVILLE: AMER INST PHYSICS. ISSN 1077-3118

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Abstract

We conducted mobility spectrum analysis on a high quality three dimensional topological insulator film of BiSbTeSe2 to extract mobility mu and carrier density n. Top and bottom gates were applied to tune the carrier density on top and bottom surfaces independently. At 1.5K, when the conduction is entirely dominated by the Dirac surface states, we always find two dominant conduction channels (top and bottom surfaces), with mu = 500 - 3000 cm(2)/(Vs) and n on the order of 1 0 12 c m - 2. However, at sufficiently high temperature ( T = 85 K), when the bulk contributes, a third channel with maximum mobility mu similar to 400cm(2)/(Vs) and n on the order of 1 0 11 - 1 0 13 c m - 2 opens. Our data show the feasibility of the method to analyze the different conduction channels in a topological insulator, being also promising for other similar material systems.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Wang, Jimin UNSPECIFIED orcid.org/0000-0002-3871-4995 UNSPECIFIED Kurzendorfer, Alexander UNSPECIFIED UNSPECIFIED UNSPECIFIED Chen, Lin UNSPECIFIED orcid.org/0000-0002-8233-800X UNSPECIFIED Wang, Zhiwei UNSPECIFIED UNSPECIFIED UNSPECIFIED Ando, Yoichi UNSPECIFIED orcid.org/0000-0002-3553-3355 UNSPECIFIED Xu, Yang UNSPECIFIED UNSPECIFIED UNSPECIFIED Miotkowski, Ireneusz UNSPECIFIED UNSPECIFIED UNSPECIFIED Chen, Yong P. UNSPECIFIED orcid.org/0000-0002-7356-4179 UNSPECIFIED Weiss, Dieter UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-595990
DOI:	10.1063/5.0047773
Journal or Publication Title:	Appl. Phys. Lett.
Volume:	118
Number:	25
Date:	2021
Publisher:	AMER INST PHYSICS
Place of Publication:	MELVILLE
ISSN:	1077-3118
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SURFACE-STATE Multiple languages Physics, Applied Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/59599