Meissner screening of Proximity coupled Topological Insulator/Superconductor Heterostructures

ORAL

Abstract

Meissner screening of proximity coupled SmB6/YB6 topological insulator-superconductor (TI/SC) thin-film-bilayers is studied through the temperature dependence of the effective penetration depth. A microwave resonator technique is used in which the bilayers are exposed to the rf magnetic field. The study is conducted by systematically varying the thickness of the SmB6 layer on top of the YB6 layer. Unconventional thickness dependence of the temperature profile of the effective magnetic penetration depth of the TI/SC bilayer is observed, which is distinctly different from that of the conventional metal/superconductor bilayers. This provides evidence for Meissner screening in the presence of bulk insulating states in the SmB6. Through an electromagnetic screening model, key parameters such as normal screening length, normal coherence length, thickness of the surface states, and Fermi velocity of SmB6 are extracted and found to be in reasonable agreement with previous studies.

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Presenters

  • Seokjin Bae

    University of Maryland, College Park

Authors

  • Seokjin Bae

    University of Maryland, College Park

  • Seunghun Lee

    University of Maryland, College Park

  • Ichiro Takeuchi

    Materials Science and Engineering, University of Maryland, University of Maryland, University of Maryland, College Park, Materials Science & Engineering Dept, University of Maryland

  • Steven Anlage

    Department of Physics, University of Maryland, College Park, University of Maryland, College Park, Department of Physics and Department of Electrical and Computer Engineering, University of Maryland, College Park, Physics Department, University of Maryland, College Park