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Title: Experimental evidences of topological surface states of β-Ag2Te
Authors: Zhu, Weiguang
Sulaev, Azat
Ren, Peng
Xia, Bin
Lin, Qing Hua
Yu, Ting
Qiu, Caiyu
Zhang, Shuang-Yuan
Han, Ming-Yong
Li, Zhi Peng
Wu, Qingyu
Feng, Yuan Ping
Shen, Lei
Shen, Shun-Qing
Wang, Lan
Keywords: DRNTU::Science::Mathematics::Topology
Issue Date: 2013
Source: Sulaev, A., Ren, P., Xia, B., Lin, Q. H., Yu, T., Qiu, C., et al. (2013). Experimental evidences of topological surface states of β-Ag2Te. AIP Advances, 3(3).
Series/Report no.: AIP advances
Abstract: We present evidence of topological surface states in β-Ag2Te through first-principles calculations, periodic quantum interference effect and ambipolar electric field effect in single crystalline nanoribbon. Our first-principles calculations show that β-Ag2Te is a topological insulator with a gapless Dirac cone with strong anisotropy. To experimentally probe the topological surface state, we synthesized high quality β-Ag2Te nanoribbons and performed electron transport measurements. The coexistence of pronounced Aharonov-Bohm oscillations and weak Altshuler-Aronov-Spivak oscillations clearly demonstrates coherent electron transport around the perimeter of β-Ag2Te nanoribbon and therefore the existence of topological surface states, which is further supported by the ambipolar electric field effect for devices fabricated by β-Ag2Te nanoribbons. The experimental evidences of topological surface states and the theoretically predicted anisotropic Dirac cone of β-Ag2Te suggest that the material may be a promising candidate of topological insulator for fundamental study and future spintronic devices.
DOI: 10.1063/1.4795735
Rights: © 2013 Author(s). This paper was published in AIP Advances and is made available as an electronic reprint (preprint) with permission of Author(s). The paper can be found at the following official DOI: [].  One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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