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arXiv · 0707.4512

Effect of Microwaves on the Current-Phase-Relation in SNS Josephson Junctions

M. Fuechsle·J. Bentner·D. A. Ryndyk·M. Reinwald·W. Wegscheider·C. Strunk
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Abstract

We investigate the current-phase-relation (CPR) of long diffusive superconductor-normal metal-superconductor (SNS) Josephson junctions in thermodynamic equilibrium and under microwave irradiation. While in equilibrium good agreement with the predictions of quasi-classical theory is found, we observe that the shape of the CPR can be strongly affected by microwave irradiation. Close to a Josephson-phase difference of pi, the supercurrent can be strongly suppressed when increasing the rf-power. Our results can be understood in terms of microwave excitation of low-lying Andreev bound states across the mini-gap in the junction. In the frequency interval studied, this mechanism becomes important when the mini-gap closes at a phase difference of pi.

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M. Fuechsle, J. Bentner, D. A. Ryndyk, M. Reinwald, W. Wegscheider, C. Strunk. 2009-02-24. Effect of Microwaves on the Current-Phase-Relation in SNS Josephson Junctions. https://arxiv.org/abs/0707.4512

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