期刊
NATURE MATERIALS
卷 11, 期 12, 页码 1023-1027出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT3449
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资金
- European Commission Network SemiSpinNet [PITN-GA-2008-215368]
- European Regional Development Fund through the Innovative Economy grant [POIG.01.01.02-00-108/09]
- Knut and Alice Wallenberg Foundation
- Swedish Research Council
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.
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