Characterization of Electron Beam Damage to (BixSb1-x)2Te3-Based Topological Insulators

ORAL

Abstract

Models for topological superconductivity based on proximitized superconductivity in quantum Hall systems have proven difficult to realize, in part, because high magnetic fields destroy Cooper pairing. The discovery of the quantum anomalous Hall (QAH) effect in Cr- and V-doped (BixSb1-x)2Te3 has attracted attention because it provides a platform to demonstrate the same models of topological superconductivity without high magnetic fields. A remaining barrier is fabrication of the desired structures. Photolithographic patterning has been employed with QAH materials to great effect but lacks the spatial resolution needed to define, for example, Josephson junctions and quantum point contacts. Electron beam lithography has largely been avoided for fear of damaging or doping the QAH material, whose Fermi level must be very precisely positioned to observe the QAH effect. We discuss our efforts to characterize electron beam damage to (BixSb1-x)2Te3-based topological insulators. We also propose possible approaches for submicron patterning involving no electrons hitting the substrate.

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Presenters

  • Linsey Rodenbach

    Stanford University

Authors

  • Linsey Rodenbach

    Stanford University

  • Ilan Rosen

    Applied Physics, Stanford University, Stanford University

  • Eli J Fox

    Stanford University

  • Lei Pan

    Electrical Engineering, University of California, Los Angeles, University of California, Los Angeles, University of California Los Angeles, Department of Electrical Engineering, University of California, Los Angeles, Electrical and Computer Engineering Department, University of California, Los Angeles

  • Peng Zhang

    University of California Los Angeles

  • Kang L. Wang

    University of California, Los Angeles, University of California Los Angeles, ECE, UCLA, Electrical and Computer Engineering Department, University of California, Los Angeles

  • David Goldhaber-Gordon

    Stanford University, Department of Physics, Stanford University, Stanford University, USA, Physics, Stanford University