Microwave Susceptibility Observation of Interacting Many-Body Andreev States

Journal article (2022)

Authors

Valla Fatemi Yale University
P. D. Kurilovich Yale University
M. Hays Yale University
D. Bouman QuTech Advanced Research Centre, BUS/Quantum Delft - QuTech Advanced Research Centre , Kavli institute of nanoscience Delft
T. Connolly Yale University
S. Diamond Yale University
P. Krogstrup University of Copenhagen
A. Geresdi QuTech Advanced Research Centre, QRD/Geresdi Lab - QuTech Advanced Research Centre , Chalmers University of Technology, Kavli institute of nanoscience Delft
M. H. Devoret Yale University
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Research Group
BUS/Quantum Delft (QuTech Advanced Research Centre) (TU Delft)
Copyright: © 2022 V. Fatemi, P. D. Kurilovich, M. Hays, D. Bouman, T. Connolly, S. Diamond, P. Krogstrup, A. Geresdi, M. H. Devoret, More Authors
DOI
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https://doi.org/10.1103/PhysRevLett.129.227701
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Published Date

2022

Language

English

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Faculty

QuTech Advanced Research Centre

Department

Business Development

Research Group

BUS/Quantum Delft

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.