Topological Aspect and Quantum Magnetoresistance of βAg2Te

Wei Zhang, Rui Yu, Wanxiang Feng, Yugui Yao, Hongming Weng, Xi Dai, and Zhong Fang
Phys. Rev. Lett. 106, 156808 – Published 14 April 2011

Abstract

To explain the unusual nonsaturating linear magnetoresistance observed in silver chalcogenides, the quantum scenario has been proposed based on the assumption of gapless linear energy spectrum. Here we show, by first principles calculations, that βAg2Te with distorted antifluorite structure is in fact a topological insulator with gapless Dirac-type surface states. The characteristic feature of this new binary topological insulator is the highly anisotropic Dirac cone, in contrast with known examples, such as Bi2Te3 and Bi2Se3. The Fermi velocity varies an order of magnitude by rotating the crystal axis.

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  • Received 6 January 2011

DOI:https://doi.org/10.1103/PhysRevLett.106.156808

© 2011 American Physical Society

Authors & Affiliations

Wei Zhang, Rui Yu, Wanxiang Feng, Yugui Yao, Hongming Weng*, Xi Dai, and Zhong Fang

  • Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

  • *hmweng@iphy.ac.cn
  • daix@iphy.ac.cn
  • zfang@iphy.ac.cn

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Issue

Vol. 106, Iss. 15 — 15 April 2011

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