Topological crystalline insulator states in Pb1-xSnxSe
2012 (English)In: Nature Materials, ISSN 1476-1122, E-ISSN 1476-4660, Vol. 11, no 12, 1023-1027 p.Article in journal (Refereed) Published
Topological insulators are a class of quantum materials in which time-reversal symmetry, relativistic effects and an inverted band structure result in the occurrence of electronic metallic states on the surfaces of insulating bulk crystals. These helical states exhibit a Dirac-like energy dispersion across the bulk bandgap, and they are topologically protected. Recent theoretical results have suggested the existence of topological crystalline insulators (TCIs), a class of topological insulators in which crystalline symmetry replaces the role of time-reversal symmetry in ensuring topological protection(1,2). In this study we show that the narrow-gap semiconductor Pb1-xSnxSe is a TCI for x = 0.23. Temperature-dependent angle-resolved photoelectron spectroscopy demonstrates that the material undergoes a temperature-driven topological phase transition from a trivial insulator to a TCI. These experimental findings add a new class to the family of topological insulators, and we anticipate that they will lead to a considerable body of further research as well as detailed studies of topological phase transitions.
Place, publisher, year, edition, pages
2012. Vol. 11, no 12, 1023-1027 p.
Inversion, Bands, Performance, Alloys, Phase, Snte
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-109176DOI: 10.1038/NMAT3449ISI: 000311432600019ScopusID: 2-s2.0-84870037398OAI: oai:DiVA.org:kth-109176DiVA: diva2:582790
FunderKnut and Alice Wallenberg FoundationSwedish Research Council
QC 201506232013-01-072012-12-212015-06-23Bibliographically approved