Transport properties of crystalline topological insulator Pb$_{1-x}$Sn$_x$Se

ORAL

Abstract

The narrow-band gap semiconductors Pb$_{1-x}$Sn$_x$Se and Pb$_{1-x}$Sn$_x$Te have received considerable attention recently following the prediction~[1] that they are examples of a topological crystalline insulator with surface states characterized by a mirror Chern number. Several ARPES groups have reported evidence for the topological surface states~[2,3]. We have investigated the transport properties of crystals of Pb$_{1-x}$Sn$_x$Se. For Sn content $x$ bracketing 0.23, we observe strong quantum oscillations from bulk carriers (either $n$ or $p$ type) with concentrations near 2$\times 10^{18}$ cm$^{-3}$ and mobilities $\sim $ 3,000 cm$^2$/Vs. The results of experiments to tune the chemical potential into the gap using chemical doping and liquid gating will be reported. References: [1] T. H. Hsieh et al., Nature Commun. {\bf 3}, 982 (2012). [2] P. Dziawa et al., Nature Materials (2012) doi:10.1038/nmat3449 [3] Su-Yang Xu et al., arXiv:1206.2088

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Authors

  • Tian Liang

    Dept. Phys. Princeton University, New Jersey 08544, Princeton University

  • Quinn Gibson

    Dept. Chem. Princeton University, New Jersey 08544

  • Jun Xiong

    Princeton University, Dept. Phys. Princeton University, New Jersey 08544

  • Max Hirschberger

    Dept. Phys. Princeton University, New Jersey 08544, Princeton University

  • Robert Cava

    Department of Chemistry, Princeton University, Dept. Chem. Princeton University, New Jersey 08544, Princeton University, Department of Chemistry, Princeton University, Princeton, NJ 08544, USA

  • Phuan Ong

    Dept. Phys. Princeton University, New Jersey 08544, Princeton University