Hybrid superinductance with Al/InAs

ORAL

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.

*This work was funded by the Defense Advanced Research Projects Agency (DARPA) Synthetic Quantum Nanostructures (SynQuaNon) program under Grant Agreement No. HR00112420343. The initial device characterizations performed at the Center for Nanoscale Materials, a U.S. Department of Energy Office of Science User Facility, was supported by the U.S. DOE, Office of Basic Energy Sciences, under Contract No. DE-AC02- 06CH11357

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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)
    • New York University

  • Jacob Issokson

    • New York University

  • Archana Kamal

    • Northwestern University
    • Northwestern University Evanston, University of Massachusetts Lowell
    • Northwestern University, Evanston, USA
    • University of Massachusetts

  • Javad Shabani

    • New York University (NYU)

  • Andrew P Higginbotham

    • University of Chicago