Hybrid superinductance with Al/InAs

Oral-In-person

Abstract

We report microwave spectroscopy of a chain of 800 Josephson junctions made from an epitaxial Al/InAs heterostructure. The devices exhibit superinductance, with the characteristic wave impedance exceeding R_Q = (hbar)/(2e)2. The planar nature of the junctions results in a large plasma frequency, with no measurable deviations from ideal dispersion up to 12 GHz. Internal quality factors decrease sharply with frequency, which we quantitatively model, potentially elucidating an internal loss mechanism in the superconductor-semiconductor junctions.

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Presenters

  • Junseok Oh

    • University of Chicago

Authors

  • Junseok Oh

    • University of Chicago

  • Ido Levy

    • New York University (NYU)

  • Tyler Cowan

    • New York University (NYU)

  • Jacob Issokson

    • New York University

  • Archana Kamal

    • Northwestern University

  • Javad Shabani

    • New York University (NYU)

  • Andrew Higginbotham