Microwave controlled phase coherent transport in mesoscopic S-N-S structures

Details Microwave controlled phase coherent transport in mesoscopic S-N-S structures Microwave controlled phase coherent transport in mesoscopic S-N-S structures

1999-05-26

arxiv.org/abs/cond-mat/9905386v1

Physics

Condensed Matter

Superconductivity

11 figures

Scientific paper

We show that transport through a superconducting quantum point contact biased at subgap voltages is strongly affected by a microwave field. The subgap current is increased by several orders of magnitude. Quantum interference among resonant scattering events involving photon absorption is reflected as an oscillating structure in the I-V curve. 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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