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Experimental evidences of topological surface states of β-Ag2Te

Authors :
Azat Sulaev
Peng Ren
Bin Xia
Qing Hua Lin
Ting Yu
Caiyu Qiu
Shuang-Yuan Zhang
Ming-Yong Han
Zhi Peng Li
Wei Guang Zhu
Qingyu Wu
Yuan Ping Feng
Lei Shen
Shun-Qing Shen
Lan Wang
Source :
AIP Advances, Vol 3, Iss 3, Pp 032123-032123 (2013)
Publication Year :
2013
Publisher :
AIP Publishing LLC, 2013.

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.

Subjects

Subjects :
Physics
QC1-999

Details

Language :
English
ISSN :
21583226
Volume :
3
Issue :
3
Database :
Directory of Open Access Journals
Journal :
AIP Advances
Publication Type :
Academic Journal
Accession number :
edsdoj.8e51d0616d774bcdba30c426731c2b2a
Document Type :
article
Full Text :
https://doi.org/10.1063/1.4795735