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Title: Gate-tuned quantum oscillations of topological surface states in β-Ag2Te
Authors: Sulaev, Azat
Zhu, Weiguang
Teo, Kie Leong
Wang, Lan
Keywords: DRNTU::Science::Physics::Atomic physics::Quantum theory
Issue Date: 2015
Source: Sulaev, A., Zhu, W., Teo, K. L., & Wang, L. (2015). Gate-tuned quantum oscillations of topological surface states in β-Ag2Te. Scientific reports, 5.
Series/Report no.: Scientific report
Abstract: We report the strong experimental evidence of the existence of topological surface states with large electric field tunability and mobility in β-Ag2Te. Pronounced 2D Shubnikov-de Haas oscillations have been observed in β-Ag2Te nanoplates. A Berry phase is determined to be near π using the Landau level fan diagram for a relatively wide nanoplate while the largest electric field ambipolar effect in topological insulator so far (~2500%) is observed in a narrow nanoplate. The π Berry phase and the evolution of quantum oscillations with gate voltage (Vg) in the nanoplates strongly indicate the presence of topological surface states in β-Ag2Te. Moreover, the mobility of the narrow Ag2Te nanoplate is about several thousand cm2s−1V−1. Our results suggest that β-Ag2Te has the potential to become an important material in the investigation of topological insulators.
ISSN: 2045-2322
DOI: 10.1038/srep08062
Rights: This work is licensed under a Creative Commons Attribution-NonCommercialShareAlike 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder in order to reproduce the material. To view a copy of this license, visit http://
Fulltext Permission: open
Fulltext Availability: With Fulltext
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