Universität zu Köln

Wang, Jimin, Gorini, Cosimo, Richter, Klaus, Wang, Zhiwei, Ando, Yoichi ORCID: 0000-0002-3553-3355 and Weiss, Dieter (2020). Two-Dimensional-Dirac Surface States and Bulk Gap Probed via Quantum Capacitance in a Three-Dimensional Topological Insulator. Nano Lett., 20 (12). S. 8493 - 8500. WASHINGTON: AMER CHEMICAL SOC. ISSN 1530-6992

Full text not available from this repository.

Abstract

BiSbTeSe2 is a 3D topological insulator (3D-TI) with Dirac type surface states and low bulk carrier density, as donors and acceptors compensate each other. Dominating low-temperature surface transport in this material is heralded by Shubnikov-de Haas oscillations and the quantum Hall effect. Here, we experimentally probe and model the electronic density of states (DOS) in thin layers of BiSbTeSe2 by capacitance experiments both without and in quantizing magnetic fields. By probing the lowest Landau levels, we show that a large fraction of the electrons filled via field effect into the system ends up in (localized) bulk states and appears as a background DOS. The surprisingly strong temperature dependence of such background DOS can be traced back to Coulomb interactions. Our results point at the coexistence and intimate coupling of Dirac surface states with a bulk many-body phase (a Coulomb glass) in 3D-TIs.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Wang, Jimin UNSPECIFIED UNSPECIFIED UNSPECIFIED Gorini, Cosimo UNSPECIFIED UNSPECIFIED UNSPECIFIED Richter, Klaus UNSPECIFIED UNSPECIFIED UNSPECIFIED Wang, Zhiwei UNSPECIFIED UNSPECIFIED UNSPECIFIED Ando, Yoichi UNSPECIFIED orcid.org/0000-0002-3553-3355 UNSPECIFIED Weiss, Dieter UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-308457
DOI:	10.1021/acs.nanolett.0c02733
Journal or Publication Title:	Nano Lett.
Volume:	20
Number:	12
Page Range:	S. 8493 - 8500
Date:	2020
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1530-6992
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ELECTRON; DENSITY Multiple languages Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/30845