Topological crystalline insulator states in Pb1−xSnxSe
| Autor: | R. Buczko, Oscar Tjernberg, Tomasz Story, E. Łusakowska, Krzysztof Dybko, B. M. Wojek, Thiagarajan Balasubramanian, Andrzej Szczerbakow, Bogdan J. Kowalski, Piotr Dziawa, M. H. Berntsen, Michał Szot |
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| Rok vydání: | 2012 |
| Předmět: |
Phase transition
Materials science Band gap FOS: Physical sciences Insulator (electricity) 02 engineering and technology Topology 01 natural sciences X-ray photoelectron spectroscopy 0103 physical sciences Topological order General Materials Science 010306 general physics Electronic band structure Condensed Matter - Materials Science business.industry Mechanical Engineering Materials Science (cond-mat.mtrl-sci) General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Semiconductor Mechanics of Materials Topological insulator Condensed Matter::Strongly Correlated Electrons 0210 nano-technology business |
| Zdroj: | Nature Materials. 11:1023-1027 |
| ISSN: | 1476-4660 1476-1122 |
| DOI: | 10.1038/nmat3449 |
| Popis: | Topological insulators are a novel class of quantum materials in which time-reversal symmetry, relativistic (spin-orbit) effects and an inverted band structure result in electronic metallic states on the surfaces of bulk crystals. These helical states exhibit a Dirac-like energy dispersion across the bulk bandgap, and they are topologically protected. Recent theoretical proposals have suggested the existence of topological crystalline insulators, a novel class of topological insulators in which crystalline symmetry replaces the role of time-reversal symmetry in topological protection [1,2]. In this study, we show that the narrow-gap semiconductor Pb(1-x)Sn(x)Se is a topological crystalline insulator for x=0.23. Temperature-dependent magnetotransport measurements and angle-resolved photoelectron spectroscopy demonstrate that the material undergoes a temperature-driven topological phase transition from a trivial insulator to a topological crystalline insulator. These experimental findings add a new class to the family of topological insulators. We expect these results to be the beginning of both a considerable body of additional research on topological crystalline insulators as well as detailed studies of topological phase transitions. v2: published revised manuscript (6 pages, 3 figures) and supplementary information (5 pages, 8 figures) |
| Databáze: | OpenAIRE |
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