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Topological crystalline insulator states in Pb1-xSnxSe

Dziawa, P.; Kowalski, B. J.; Dybko, K.; Buczko, R.; Szczerbakow, A.; Szot, M.; Lusakowska, E.; Thiagarajan, Balasubramanian LU ; Wojek, B. M. and Berntsen, M. H., et al. (2012) In Nature Materials 11(12). p.1023-1027
Abstract
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... (More)
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. (Less)
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published
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Nature Materials
volume
11
issue
12
pages
1023 - 1027
publisher
Nature Publishing Group
external identifiers
  • wos:000311432600019
  • scopus:84870037398
ISSN
1476-4660
DOI
10.1038/NMAT3449
language
English
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yes
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c60f683d-ef68-4bd2-b5a7-3d08b54df0c7 (old id 3379515)
date added to LUP
2013-01-30 14:33:34
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2017-11-19 03:07:57
@article{c60f683d-ef68-4bd2-b5a7-3d08b54df0c7,
  abstract     = {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.},
  author       = {Dziawa, P. and Kowalski, B. J. and Dybko, K. and Buczko, R. and Szczerbakow, A. and Szot, M. and Lusakowska, E. and Thiagarajan, Balasubramanian and Wojek, B. M. and Berntsen, M. H. and Tjernberg, O. and Story, T.},
  issn         = {1476-4660},
  language     = {eng},
  number       = {12},
  pages        = {1023--1027},
  publisher    = {Nature Publishing Group},
  series       = {Nature Materials},
  title        = {Topological crystalline insulator states in Pb1-xSnxSe},
  url          = {http://dx.doi.org/10.1038/NMAT3449},
  volume       = {11},
  year         = {2012},
}