Gate-controlled surface conduction in Na-doped Bi2Te3 topological insulator nanoplates

Wang, Yong and Xiu, Faxian and Cheng, Lina and He, Liang and Lang, Murong and Tang, Jianshi and Kou, Xufeng and Yu, Xinxin and Jiang, Xiaowei and Chen, Zhigang and Zou, Jin and Wang, Kang L. (2012) Gate-controlled surface conduction in Na-doped Bi2Te3 topological insulator nanoplates. Nano Letters, 12 (3). pp. 1170-1175. ISSN 1530-6992

Abstract

Exploring exciting and exotic physics, scientists are pursuing practical device applications for topological insulators. The Dirac-like surface states in topological insulators are protected by the time-reversal symmetry, which naturally forbids backscattering events during the carrier transport process, and therefore offers promising applications in dissipationless spintronic devices. Although considerable efforts have been devoted to controlling their surface conduction, limited work has been focused on tuning surface states and bulk carriers in Bi 2Te 3 nanostructures by external field. Here we report gate-tunable surface conduction in Na-doped Bi 2Te 3 topological insulator nanoplates. Significantly, by applying external gate voltages, such topological insulators can be tuned from p-type to n-type. Our results render a promise in finding novel topological insulators with enhanced surface states.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version cannot be displayed due to copyright restrictions.
Faculty / Department / School: No Faculty
Date Deposited: 08 Jun 2017 03:34
Last Modified: 27 Jun 2017 02:30
Uncontrolled Keywords: bismuth telluride; field-effect transistor; sodium doping; surface states; topological insulator; bismuth telluride; bulk carrier; carrier transport process; device application; enhanced surface; external fields; gate voltages; Na doped; nanoplates; P-type; spintronic device; surface conduction; time reversal symmetries; topological insulators; alkali metals; electric components and equipment; semiconductor devices and integrated circuits; applied physics generally; high energy physics; nuclear physics; plasma physics
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091299 Materials Engineering not elsewhere classified
02 Physical Sciences > 0299 Other Physical Sciences > 029999 Physical Sciences not elsewhere classified
03 Chemical Sciences > 0303 Macromolecular and Materials Chemistry > 030302 Nanochemistry and Supramolecular Chemistry
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970103 Expanding Knowledge in the Chemical Sciences
Identification Number or DOI: 10.1021/nl202920p
URI: http://eprints.usq.edu.au/id/eprint/31724

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