Insulating behavior in ultra-low carrier density Bismuth Selenide single crystals

ORAL

Abstract

The topological insulator material Bi$_2$Se$_3$ is well known to suffer from a non-insulating bulk due to doping caused by selenium vacancies. We present results on the synthesis and characterization of pure undoped Bi$_2$Se$_3$ crystals that exhibit nonmetallic transport behavior over the entire measured temperature range, from room temperature down to at least 2 K. Measurements of longitudinal transport and Hall effect are used to characterize the transport temperature and magnetic field dependences, carrier sign and density, and sensitivity to air exposure.

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Authors

  • Paul Syers

    University of Maryland, Department of Physics, University of Maryland

  • Johnpierre Paglione

    Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland-College Park, Ceter for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD 20742, University of Maryland, Department of Physics, University of Maryland, Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD 20742, Center for Nanophysics and Advanced Materials, Dept. of Physics, University of Maryland, College Park