1. Microwave susceptibility observation of interacting many-body Andreev states
- Author
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Fatemi, V., Kurilovich, P. D., Hays, M., Bouman, D., Connolly, T., Diamond, S., Frattini, N. E., Kurilovich, V. D., Krogstrup, P., Nygard, J., Geresdi, A., Glazman, L. I., and Devoret, M. H.
- Subjects
Condensed Matter - Mesoscale and Nanoscale Physics ,Condensed Matter - Superconductivity - 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.
- Published
- 2021
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