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Title: Experimental evidences of topological surface states of β-Ag 2Te
Authors: Sulaev, A.
Ren, P.
Xia, B.
Lin, Q.H.
Yu, T.
Qiu, C.
Zhang, S.-Y.
Han, M.-Y.
Li, Z.P.
Zhu, W.G.
Wu, Q.
Feng, Y.P. 
Shen, L. 
Shen, S.-Q.
Wang, L.
Issue Date: 2013
Source: Sulaev, A., Ren, P., Xia, B., Lin, Q.H., Yu, T., Qiu, C., Zhang, S.-Y., Han, M.-Y., Li, Z.P., Zhu, W.G., Wu, Q., Feng, Y.P., Shen, L., Shen, S.-Q., Wang, L. (2013). Experimental evidences of topological surface states of β-Ag 2Te. AIP Advances 3 (3) : -. ScholarBank@NUS Repository.
Abstract: We present evidence of topological surface states in β-Ag 2Te 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. © 2013 Copyright 2013 Author(s). This article is distributed under a Creative Commons Attribution 3.0 Unported License.
Source Title: AIP Advances
ISSN: 21583226
DOI: 10.1063/1.4795735
Appears in Collections:Staff Publications

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