Topological quantum phase transition from mirror to time
reversal symmetry protected topological insulator

J 2017

Topological quantum phase transition from mirror to time reversal symmetry protected topological insulator

MANDAL, P. S., G. SPRINGHOLZ, V. V. VOLOBUEV, Ondřej CAHA, A. VARYKHALOV et. al.

Basic information

Original name

Topological quantum phase transition from mirror to time reversal symmetry protected topological insulator

Authors

MANDAL, P. S. (356 India), G. SPRINGHOLZ (40 Austria), V. V. VOLOBUEV (804 Ukraine), Ondřej CAHA (203 Czech Republic, guarantor, belonging to the institution), A. VARYKHALOV (643 Russian Federation), E. GOLIAS (300 Greece), G. BAUER (40 Austria), O. RADER (276 Germany) and J. SANCHEZ-BARRIGA (724 Spain)

Edition

Nature Communications, London, Nature Publishing Group, 2017, 2041-1723

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10302 Condensed matter physics

Country of publisher

United Kingdom of Great Britain and Northern Ireland

Confidentiality degree

není předmětem státního či obchodního tajemství

Impact factor

Impact factor: 12.353

RIV identification code

RIV/00216224:14310/17:00099461

Organization unit

Faculty of Science

DOI

http://dx.doi.org/10.1038/s41467-017-01204-0

UT WoS

000413117400002

Keywords in English

IV-VI COMPOUNDS; CRYSTALLINE INSULATOR; CARRIER DENSITY; SNTE; PB1-XSNXSE; INVERSION; GETE; GAP

Abstract

V originále

Topological insulators constitute a new phase of matter protected by symmetries. Time-reversal symmetry protects strong topological insulators of the Z(2) class, which possess an odd number of metallic surface states with dispersion of a Dirac cone. Topological crystalline insulators are merely protected by individual crystal symmetries and exist for an even number of Dirac cones. Here, we demonstrate that Bi-doping of Pb1-xSnxSe (111) epilayers induces a quantum phase transition from a topological crystalline insulator to a Z(2) topological insulator. This occurs because Bi-doping lifts the fourfold valley degeneracy and induces a gap at (Gamma) over bar, while the three Dirac cones at the (M) over bar points of the surface Brillouin zone remain intact. We interpret this new phase transition as caused by a lattice distortion. Our findings extend the topological phase diagram enormously and make strong topological insulators switchable by distortions or electric fields.

Citovat

MANDAL, P. S., G. SPRINGHOLZ, V. V. VOLOBUEV, Ondřej CAHA, A. VARYKHALOV, E. GOLIAS, G. BAUER, O. RADER and J. SANCHEZ-BARRIGA. Topological quantum phase transition from mirror to time reversal symmetry protected topological insulator. Nature Communications. London: Nature Publishing Group, 2017, vol. 8, October, p. "968-1"-"968-7", 7 pp. ISSN 2041-1723. Available from: https://dx.doi.org/10.1038/s41467-017-01204-0.

@article{1403944,
   author = {Mandal, P. S. and Springholz, G. and Volobuev, V. V. and Caha, Ondřej and Varykhalov, A. and Golias, E. and Bauer, G. and Rader, O. and SanchezandBarriga, J.},
   article_location = {London},
   article_number = {October},
   doi = {http://dx.doi.org/10.1038/s41467-017-01204-0},
   keywords = {IV-VI COMPOUNDS; CRYSTALLINE INSULATOR; CARRIER DENSITY; SNTE; PB1-XSNXSE; INVERSION; GETE; GAP},
   language = {eng},
   issn = {2041-1723},
   journal = {Nature Communications},
   title = {Topological quantum phase transition from mirror to time reversal symmetry protected topological insulator},
   volume = {8},
   year = {2017}
}

TY  - JOUR
ID  - 1403944
AU  - Mandal, P. S. - Springholz, G. - Volobuev, V. V. - Caha, Ondřej - Varykhalov, A. - Golias, E. - Bauer, G. - Rader, O. - Sanchez-Barriga, J.
PY  - 2017
TI  - Topological quantum phase transition from mirror to time reversal symmetry protected topological insulator
JF  - Nature Communications
VL  - 8
IS  - October
SP  - "968-1"-"968-7"
EP  - "968-1"-"968-7"
PB  - Nature Publishing Group
SN  - 20411723
KW  - IV-VI COMPOUNDS
KW  - CRYSTALLINE INSULATOR
KW  - CARRIER DENSITY
KW  - SNTE
KW  - PB1-XSNXSE
KW  - INVERSION
KW  - GETE
KW  - GAP
N2  - Topological insulators constitute a new phase of matter protected by symmetries. Time-reversal symmetry protects strong topological insulators of the Z(2) class, which possess an odd number of metallic surface states with dispersion of a Dirac cone. Topological crystalline insulators are merely protected by individual crystal symmetries and exist for an even number of Dirac cones. Here, we demonstrate that Bi-doping of Pb1-xSnxSe (111) epilayers induces a quantum phase transition from a topological crystalline insulator to a Z(2) topological insulator. This occurs because Bi-doping lifts the fourfold valley degeneracy and induces a gap at (Gamma) over bar, while the three Dirac cones at the (M) over bar points of the surface Brillouin zone remain intact. We interpret this new phase transition as caused by a lattice distortion. Our findings extend the topological phase diagram enormously and make strong topological insulators switchable by distortions or electric fields.
ER  -

MANDAL, P. S., G. SPRINGHOLZ, V. V. VOLOBUEV, Ondřej CAHA, A. VARYKHALOV, E. GOLIAS, G. BAUER, O. RADER and J. SANCHEZ-BARRIGA. Topological quantum phase transition from mirror to time reversal symmetry protected topological insulator. \textit{Nature Communications}. London: Nature Publishing Group, 2017, vol.~8, October, p.~''968-1''-''968-7'', 7 pp. ISSN~2041-1723. Available from: https://dx.doi.org/10.1038/s41467-017-01204-0.

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