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arXiv · 2112.05624

Microwave susceptibility observation of interacting many-body Andreev states

V. Fatemi·P. D. Kurilovich·M. Hays·D. Bouman·T. Connolly·S. Diamond·N. E. Frattini·V. D. Kurilovich·P. Krogstrup·J. Nygard·A. Geresdi·L. I. Glazman·M. H. Devoret
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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, $\pi$-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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V. Fatemi, P. D. Kurilovich, M. Hays, D. Bouman, T. Connolly, S. Diamond, N. E. Frattini, V. D. Kurilovich, P. Krogstrup, J. Nygard, A. Geresdi, L. I. Glazman, M. H. Devoret. 2021-12-10. Microwave susceptibility observation of interacting many-body Andreev states. https://doi.org/10.1103/physrevlett.129.227701

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