High field magnetotransport in high purity crystals of topological insulator Bi$_2$Se$_3$

ORAL

Abstract

We have synthesized crystals of high purity undoped Bi$_2$Se$_3$ with carrier density less than 10$^{17}$ cm$^{-3}$ and high bulk mobility. Thorough characterizations of transport and optical properties in fields up to 14 T suggest a high surface scattering rate [1-3]. In a search for quantum oscillations from the surface carriers, we performed measurements of longitudinal and Hall resistance in pulsed magnetic fields of up to 60 T. Due to the as-yet poorly characterized environmental sensitivity of the Bi$_2$Se$_3$ surfaces, we performed on-site cleaving and application of leads under dry flowing nitrogen. The Hall measurements and temperature- and angle-dependence of the longitudinal magnetoresistance will be discussed. \\[4pt] [1] N. P. Butch, et al., Phys. Rev. B 81, 241301 (2010) \\[0pt] [2] A. B. Sushkov, et al., Phys. Rev. B 82, 125110 (2010) \\[0pt] [3] G. S. Jenkins, et al., Phys. Rev. B 82, 125120 (2010)

*This work was supported by the NSF-MRSEC at the University of Maryland, DMR \# 0520471.

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Authors

  • Nick Butch

    • Center for Nanophysics and Advanced Materials, U. of Maryland
    • Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD
    • Center for Nano Physics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD
    • Department of Physics, University of Maryland
    • Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park
    • University of Maryland
    • Center for Nanophysics \& Advanced Materials and Department of Physics, University of Maryland, College Park, MD 20742, USA

  • Paul Syers

    • Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park

  • Johnpierre Paglione

    • Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park