Solution to the hole-doping problem and tunable quantum Hall effect in Bi2Se3 thin films

ORAL

Abstract

Bi2Se3, one of the most widely studied topological insulators (TIs), is naturally electron-doped due to n-type native defects. However, many years of efforts to achieve p-type Bi2Se3 thin films have failed so far. In this presentation, we provide a solution to this long-standing problem, showing that the main culprit has been the high density of interfacial defects. By suppressing these defects through an interfacial engineering scheme, we have successfully implemented p-type Bi2Se3 thin films down to the thinnest topological regime. On this platform, we present the first tunable quantum Hall effect (QHE) study in Bi2Se3 thin films, and reveal not only significantly asymmetric QHE signatures across the Dirac point but also the presence of competing anomalous states near the zeroth Landau level.

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Presenters

  • Jisoo Moon

    Physics and Astronomy, Rutgers University, Physics and Astronomy, Rutgers Univ, Rutgers University

Authors

  • Jisoo Moon

    Physics and Astronomy, Rutgers University, Physics and Astronomy, Rutgers Univ, Rutgers University

  • Nikesh Koirala

    Department of Physics and Astronomy, Rutgers University, Physics and Astronomy, Rutgers Univ, Massachusetts Institute of Technology

  • Maryam Salehi

    Department of Physics and Astronomy, Rutgers University, Material Science and Engineering, Rutgers University, Physics and Astronomy, Rutgers Univ, Rutgers, the State University of New Jersey, Rutgers University

  • Wenhan Zhang

    Rutgers-Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Rutgers Univ, Physics and Astronomy, Rutgers Univ

  • Weida Wu

    Department of Physics and Astronomy, Rutgers University, Rutgers-Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Rutgers Univ, Physics and Astronomy, Rutgers Univ, Department of Physics and Astronomy, Rutgers, the State College of New Jersey

  • Seongshik Oh

    Department of Physics and Astronomy, Rutgers University, Physics and Astronomy, Rutgers University, Physics and Astronomy, Rutgers Univ, Rutgers, the State University of New Jersey, Rutgers University