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Observation of Time-Reversal-Protected Single-Dirac-Cone Topological-Insulator States in Bi_2Te_3 and Sb_2Te_3

Hsieh, D. and Xia, Y. and Qian, D. and Wray, L. and Meier, F. and Dil, J. H. and Osterwalder, J. and Patthey, L. and Fedorov, A. V. and Lin, H. and Bansil, A. and Grauer, D. and Hor, Y. S. and Cava, R. J. and Hasan, M. Z. (2009) Observation of Time-Reversal-Protected Single-Dirac-Cone Topological-Insulator States in Bi_2Te_3 and Sb_2Te_3. Physical Review Letters, 103 (14). Art. No. 146401. ISSN 0031-9007. doi:10.1103/PhysRevLett.103.146401.

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We show that the strongly spin-orbit coupled materials Bi_2Te_3 and Sb_2Te_3 and their derivatives belong to the Z_2 topological-insulator class. Using a combination of first-principles theoretical calculations and photoemission spectroscopy, we directly show that Bi_2Te_3 is a large spin-orbit-induced indirect bulk band gap (δ∼150  meV) semiconductor whose surface is characterized by a single topological spin-Dirac cone. The electronic structure of self-doped Sb_2Te_3 exhibits similar Z_2 topological properties. We demonstrate that the dynamics of spin-Dirac fermions can be controlled through systematic Mn doping, making these materials classes potentially suitable for topological device applications.

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Hsieh, D.0000-0002-0812-955X
Alternate Title:Observation of Time-Reversal-Protected Single-Dirac-Cone Topological-Insulator States in Bi2Te3 and Sb2Te3
Additional Information:© 2009 The American Physical Society. Received 18 June 2009. Published 28 September 2009. The use of synchrotron x rays and theoretical computations is supported by DOE/BES (No. DE-FG-02-05ER46200, No. AC03-76SF00098, and No. DE-FG02-07ER46352). Materials growth is supported by NSF (No. DMR-0819860). M. Z. H. acknowledges the A. P. Sloan Foundation.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG-02- 05ER46200
Department of Energy (DOE)AC03-76SF00098
Department of Energy (DOE)DE-FG02- 07ER46352
Alfred P. Sloan FoundationUNSPECIFIED
Issue or Number:14
Classification Code:PACS numbers: 71.20.b, 71.10.Pm, 73.20.At, 73.23.b
Record Number:CaltechAUTHORS:20140828-154214025
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49029
Deposited By: Joy Painter
Deposited On:29 Aug 2014 21:31
Last Modified:10 Nov 2021 18:39

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