Microwave Susceptibility Observation of Interacting Many-Body Andreev States

V. Fatemi, P. D. Kurilovich, M. Hays, D. Bouman, T. Connolly, S. Diamond, P. Krogstrup, A. Geresdi, M. H. Devoret, More Authors

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)
45 Downloads (Pure)


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.

Original languageEnglish
Article number227701
Number of pages7
JournalPhysical review letters
Issue number22
Publication statusPublished - 2022


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