Towards RF spectroscopy of Andreev bound states in an InAs-Al 2DEG

ORAL

Abstract

Hybrid superconducting-semiconducting heterostructures provide a promising platform for investigating topological superconductivity via the proximity effect. Planar multi-terminal Josephson junctions (JJs) [1] are predicted to host zero-energy Andreev bound states (ABSs). In this regard, we present the characterization of conventional two-terminal JJs in an InAs two-dimensional electron gas (2DEG) with epitaxially grown Al. By applying an external magnetic flux, we can tune the superconducting phase difference in a superconducting quantum interference device (SQUID). We further implement a gated InAs-Al JJ in a coplanar waveguide (CPW) resonator [2] to perform microwave spectroscopy of ABSs for studying unconventional superconductivity in such JJs.



[1] N. Pankratov et al., Phys. Rev. X 10, 031051 (2020)

[2] W.M. Strickland et al., Phys. Rev. Applied 19, 034021 (2023)

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Presenters

  • Arunav Bordoloi

    University of Maryland, College Park, University of Maryland

Authors

  • Arunav Bordoloi

    University of Maryland, College Park, University of Maryland

  • Shukai Liu

    University of Maryland, College Park

  • Vladimir E Manucharyan

    University of Maryland, College Park, École Polytechnique Fédérale de Lausanne