Topological Aspect and Quantum Magnetoresistance of $β$-Ag$_2$Te

Details Topological Aspect and Quantum Magnetoresistance of $β$-Ag$_2$Te Topological Aspect and Quantum Magnetoresistance of $β$-Ag$_2$Te

2011-01-04

arxiv.org/abs/1101.0667v2

Phys. Rev. Lett. 106, 156808 (2011)

Physics

Condensed Matter

Materials Science

4 pages, 4 figures

Scientific paper

To explain the unusual non-saturating 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 $\beta$-Ag$_2$Te with distorted anti-fluorite 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 to known examples, such as Bi$_2$Te$_3$ and Bi$_2$Se$_3$. The Fermi velocity varies an order of magnitude by rotating the crystal axis.

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