| 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. |
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@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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