Mesoscopic superconductors under irradiation: Microwave spectroscopy of Andreev states
N. I. Lundin, L. Y. Gorelik, R. I. Shekhter, V. S. Shumeiko, M., Jonson (Chalmers, Goteborg University, Goteborg, SWEDEN)
TL;DR
This paper demonstrates how microwave irradiation can reveal and manipulate Andreev states in mesoscopic superconductors, enabling spectroscopy and detection of weak signals through quantum interference effects.
Contribution
It introduces a method to use microwave spectroscopy for probing Andreev states and discusses the impact of quantum interference on signal detection and dephasing.
Findings
Microwave irradiation removes subgap transport suppression.
Quantum interference enables spectroscopy of Andreev levels.
Interference effects can detect weak electromagnetic signals.
Abstract
We show that irradiation of a voltage-biased superconducting quantum point contact at frequencies of the order of the gap energy can remove the suppression of subgap dc transport through Andreev levels. Quantum interference among resonant scattering events involving photon absorption is furthermore shown to make microwave spectroscopy of the Andreev levels feasible. We also discuss how the same interference effect can be applied for detecting weak electromagnetic signals up to the gap frequency, and how it is affected by dephasing and relaxation.
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