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  • Fatemi, V., et al. (author)
  • Microwave Susceptibility Observation of Interacting Many-Body Andreev States
  • 2022
  • In: Physical Review Letters. - 1079-7114 .- 0031-9007. ; 129:22
  • Journal article (peer-reviewed)abstract
    • Electrostatic charging affects the many-body spectrum of Andreev states, yet its influence on their microwave properties has not been elucidated. We developed a circuit quantum electrodynamics probe that, in addition to transition spectroscopy, measures the microwave susceptibility of different states of a semiconductor nanowire weak link with a single dominant (spin-degenerate) Andreev level. We found that the microwave susceptibility does not exhibit a particle-hole symmetry, which we qualitatively explain as an influence of Coulomb interaction. Moreover, our state-selective measurement reveals a large, ?-phase shifted contribution to the response common to all many-body states which can be interpreted as arising from a phase-dependent continuum in the superconducting density of states.
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