Radiation enhanced antiferromagnetic exchange between spins in a superconducting host

ORAL

Abstract

A magnetic impurity on a conventional superconductor can host a localized bound state whose energy lies inside the superconducting gap. If the distance between two such impurities is smaller than the coherence length, the presence of these so-called Yu-Shiba-Rusinov (YSR) bound states can induce an antiferromagnetic exchange interaction between the impurities, falling off as 1/r2. The small magnitude of the YSR interaction makes its obesrvation extremely challenging. We demonstrate that both the strength of the YSR interaction, as well as its spatial dependence, can be controlled via radiation assisted virtual occupation of bound states. Finally, we propose an experimental scheme for observing such radiation enhanced YSR interactions in a circuit-QED system.

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Presenters

  • Kamphol Akkaravarawong

    • Department of Physics, Univ of California - Berkeley

Authors

  • Kamphol Akkaravarawong

    • Department of Physics, Univ of California - Berkeley

  • Jukka Vayrynen

    • Station Q, Microsoft Research

  • Jay Sau

    • Univ of Maryland-College Park
    • Department of Physics, Condensed Matter Theory Center and Joint Quantum Institute, Univ of Maryland-College Park
    • University of Maryland
    • Condensed Matter Theory Center, University of Maryland
    • Physics, Univ of Maryland-College Park
    • Department of Physics, University of Maryland

  • Leonid Glazman

    • Applied Physics, Yale University
    • Physics and Applied Physics, Yale University
    • Yale University
    • Department of Physics, Yale University

  • Norman Yao

    • Physics, Univ of California - Berkeley
    • Department of Physics, University of California
    • University of California, Berkeley
    • Univ of California - Berkeley
    • University of California Berkeley
    • Physics, University of California, Berkeley
    • Department of Physics, Univ of California - Berkeley