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