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Microwave Susceptibility Observation of Interacting Many-Body Andreev States
V Fatemi1, P D Kurilovich1, M Hays1
1Departments of Physics and Applied Physics, Yale University, New Haven, Connecticut 06520, USA.
Physical Review Letters
|December 9, 2022
Summary
We investigated how electrostatic charging impacts Andreev states in semiconductor nanowires. Our findings reveal a lack of particle-hole symmetry in microwave susceptibility, influenced by Coulomb interactions.
Area of Science:
- Condensed Matter Physics
- Quantum Electrodynamics
- Mesoscopic Physics
Background:
- Electrostatic charging significantly impacts the many-body spectrum of Andreev states.
- The influence of electrostatic charging on the microwave properties of these states remains poorly understood.
Purpose of the Study:
- To elucidate the effect of electrostatic charging on the microwave properties of Andreev states.
- To investigate the particle-hole symmetry and phase-dependent contributions in the microwave susceptibility of semiconductor nanowire weak links.
Main Methods:
- Development of a circuit quantum electrodynamics probe for transition spectroscopy and microwave susceptibility measurements.
- State-selective measurements on a semiconductor nanowire weak link with a dominant spin-degenerate Andreev level.
Main Results:
- Microwave susceptibility was found to lack particle-hole symmetry, attributed to Coulomb interaction.
- A π-phase shifted contribution, common to all many-body states, was observed.
- This contribution is interpreted as arising from a phase-dependent continuum in the superconducting density of states.
Conclusions:
- Electrostatic charging influences the microwave response of Andreev states beyond spectral changes.
- Coulomb interactions play a crucial role in breaking particle-hole symmetry in these microwave properties.
- The observed phase-shifted contribution offers insights into the nature of the superconducting density of states.
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