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Special Issue:
TOPICAL REVIEW — Topological electronic states
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| TOPICAL REVIEW—Topological electronic states |
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Two-dimensional topological insulators with large bulk energy gap |
| Z Q Yang(杨中强)1,2, Jin-Feng Jia(贾金锋)1,2, Dong Qian(钱冬)1,2 |
1 Key Laboratory of Artificial Structures and Quantum Control(Ministry of Education), Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China;
2 Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China |
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Abstract Two-dimensional (2D) topological insulators (TIs, or quantum spin Hall insulators) are special insulators that possess bulk 2D electronic energy gap and time-reversal symmetry protected one-dimensional (1D) edge state. Carriers in the edge state have the property of spin-momentum locking, enabling dissipation-free conduction along the 1D edge. The existence of 2D TIs was confirmed by experiments in semiconductor quantum wells. However, the 2D bulk gaps in those quantum wells are extremely small, greatly limiting potential application in future electronics and spintronics. Despite this limitation, 2D TIs with a large bulk gap attracted plenty of interest. In this paper, recent progress in searching for TIs with a large bulk gap is reviewed briefly. We start by introducing some theoretical predictions of these new materials and then discuss some recent important achievements in crystal growth and characterization.
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Received: 14 July 2016
Revised: 09 September 2016
Accepted manuscript online:
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PACS:
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73.20.-r
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(Electron states at surfaces and interfaces)
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71.15.-m
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(Methods of electronic structure calculations)
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73.61.Cw
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(Elemental semiconductors)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. U1632272, 11574201, and 11521404). D. Q. acknowledges support from the Changjiang Scholars Program, China and the Program for Professor of Special Appointment (Eastern Scholar), China. |
Corresponding Authors:
Dong Qian
E-mail: dqian@sjtu.edu.cn
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Cite this article:
Z Q Yang(杨中强), Jin-Feng Jia(贾金锋), Dong Qian(钱冬) Two-dimensional topological insulators with large bulk energy gap 2016 Chin. Phys. B 25 117312
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