Manipulating surface states in topological insulator nanoribbons

Xiu, Faxian and He, Liang and Wang, Yong and Cheng, Lina and Chang, Li Te and Lang, Murong and Huang, Guan and Kou, Xufeng and Zhou, Yi and Jiang, Xiaowei and Chen, Zhigang ORCID: and Zou, Jin and Shailos, Alexandros and Wang, Kang L. (2011) Manipulating surface states in topological insulator nanoribbons. Nature Nanotechnology, 6 (4). pp. 216-221. ISSN 1748-3395


Topological insulators display unique properties, such as the quantum spin Hall effect, because time-reversal symmetry allows charges and spins to propagate along the edge or surface of the topological insulator without scattering. However, the direct manipulation of these edge/surface states is difficult because they are significantly outnumbered by bulk carriers. Here, we report experimental evidence for the modulation of these surface states by using a gate voltage to control quantum oscillations in Bi2 Te3 nanoribbons. Surface conduction can be significantly enhanced by the gate voltage, with the mobility and Fermi velocity reaching values as high as ∼5,800 cm2 V-1 s -1 and ∼3.7×105 m s-1, respectively, with up to ∼51% of the total conductance being due to the surface states. We also report the first observation of h/2e periodic oscillations, suggesting the presence of time-reversed paths with the same relative zero phase at the interference point. The high surface conduction and ability to manipulate the surface states demonstrated here could lead to new applications in nanoelectronics and spintronics.

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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/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 07 Jun 2017 03:19
Last Modified: 07 Jun 2017 03:50
Uncontrolled Keywords: biophysics, bioengineering and medical instrumentation
Fields of Research (2008): 02 Physical Sciences > 0299 Other Physical Sciences > 029903 Medical Physics
02 Physical Sciences > 0299 Other Physical Sciences > 029901 Biological Physics
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970106 Expanding Knowledge in the Biological Sciences
E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
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