Investigation of Positron Sticking to the Surfaces of Topological Insulators

ORAL

Abstract

We describe experiments aimed at probing the sticking of positrons to the surfaces of topological insulators. In these experiments, a magnetically beam will be used to deposit positrons at the surface of Bi$_{2}$Te$_{2}$Se. The energy spectra and intensities of electrons emitted as a result of Positron Annihilation induced Auger electron Spectroscopy (PAES) provides a distinct element specific signal which can be used to determine if positrons can be trapped efficiently into a surface localized bound state. The experiments are aimed at determining the practicality of using positron annihilation to selectively probe the critically important top most layer of topological insulator system.

*Welch Y1100, NSF DMR 0907679

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Authors

  • Karthik Shastry

    • University of Texas at Arlington
    • Department of Physics, University of Texas at Arlington
    • Dept of Physics, University of Texas at Arlington

  • P.V. Joglekar

    • University of Texas at Arlington

  • Antoine Olenga

    • Department of Physics, University of Texas at Arlington
    • University of Texas at Arlington

  • N.G. Fazleev

    • University of Texas at Arlington

  • Alexander Weiss

    • Department of Physics, University of Texas at Arlington
    • University of Texas at Arlington
    • Dept of Physics, University of Texas at Arlington

  • B. Barbiellini

    • Northeastern University