Universität zu Köln

Trang, Chi Xuan ORCID: 0000-0002-0995-3479, Wang, Zhiwei ORCID: 0000-0003-0182-2471, Yamada, Keiko, Souma, Seigo, Sato, Takafumi ORCID: 0000-0002-4544-5463, Takahashi, Takashi, Segawa, Kouji and Ando, Yoichi ORCID: 0000-0002-3553-3355 (2016). Metal-insulator transition and tunable Dirac-cone surface state in the topological insulator TlBi1-xSbxTe2 studied by angle-resolved photoemission. Phys. Rev. B, 93 (16). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

We report a systematic angle-resolved photoemission spectroscopy on topological insulator (TI) TlBi1-xSbxTe2 which is bulk insulating at 0.5 less than or similar to x less than or similar to 0.9 and undergoes a metal-insulator-metal transition with the Sb content x. We found that this transition is characterized by a systematic hole doping with increasing x, which results in the Fermi-level crossings of the bulk conduction and valence bands at x similar to 0 and x similar to 1, respectively. The Dirac point of the topological surface state is gradually isolated from the valence-band edge, accompanied by a sign reversal of Dirac carriers. We also found that the Dirac velocity is the largest among known solid-solution TI systems. The TlBi1-xSbxTe2 system thus provides an excellent platform for Dirac-cone engineering and device applications of TIs.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Trang, Chi Xuan UNSPECIFIED orcid.org/0000-0002-0995-3479 UNSPECIFIED Wang, Zhiwei UNSPECIFIED orcid.org/0000-0003-0182-2471 UNSPECIFIED Yamada, Keiko UNSPECIFIED UNSPECIFIED UNSPECIFIED Souma, Seigo UNSPECIFIED UNSPECIFIED UNSPECIFIED Sato, Takafumi UNSPECIFIED orcid.org/0000-0002-4544-5463 UNSPECIFIED Takahashi, Takashi UNSPECIFIED UNSPECIFIED UNSPECIFIED Segawa, Kouji UNSPECIFIED UNSPECIFIED UNSPECIFIED Ando, Yoichi UNSPECIFIED orcid.org/0000-0002-3553-3355 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-278569
DOI:	10.1103/PhysRevB.93.165123
Journal or Publication Title:	Phys. Rev. B
Volume:	93
Number:	16
Date:	2016
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/27856