Universität zu Köln

Bagchi, Mahasweta, Pitz-Paal, Lea, Grams, Christoph P., Breunig, Oliver ORCID: 0000-0001-8651-1757, Borgwardt, Nick, Wang, Zhiwei ORCID: 0000-0003-0182-2471, Ando, Yoichi ORCID: 0000-0002-3553-3355, Grueninger, Markus and Hemberger, Joachim (2019). Large positive magnetoconductivity at microwave frequencies in the compensated topological insulator BiSbTeSe2. Phys. Rev. B, 99 (16). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

The bulk electronic properties of compensated topological insulators are strongly affected by the self-organized formation of charge puddles at low temperature, but their response in the microwave frequency range is little studied. We employed broadband impedance spectroscopy up to 5 GHz to address the ac transport properties of well-compensated BiSbTeSe2, where charge puddles are known to form as metallic entities embedded in an insulating host. It turns out that the average puddle size sets the characteristic frequency v e in the gigahertz range, across which the insulating dc behavior is separated from a metal-like high-frequency response of delocalized carriers within the puddles. This nu(c) is found to be controlled by a magnetic field, giving rise to a large positive magnetoconductivity observable only in the gigahertz range. This curious phenomenon is driven by the Zeeman energy which affects the local band filling in the disordered potential landscape to enhance the puddle size.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Bagchi, Mahasweta UNSPECIFIED UNSPECIFIED UNSPECIFIED Pitz-Paal, Lea UNSPECIFIED UNSPECIFIED UNSPECIFIED Grams, Christoph P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Breunig, Oliver UNSPECIFIED orcid.org/0000-0001-8651-1757 UNSPECIFIED Borgwardt, Nick UNSPECIFIED UNSPECIFIED UNSPECIFIED Wang, Zhiwei UNSPECIFIED orcid.org/0000-0003-0182-2471 UNSPECIFIED Ando, Yoichi UNSPECIFIED orcid.org/0000-0002-3553-3355 UNSPECIFIED Grueninger, Markus UNSPECIFIED UNSPECIFIED UNSPECIFIED Hemberger, Joachim UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-150265
DOI:	10.1103/PhysRevB.99.161121
Journal or Publication Title:	Phys. Rev. B
Volume:	99
Number:	16
Date:	2019
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
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 Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/15026