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arXiv · 1702.05751

Tunable pseudogaps due to non-local coherent transport in voltage-biased three-terminal Josephson junctions

Ciprian Padurariu·Thibaut Jonckheere·Jérôme Rech·Thierry Martin·Denis Feinberg
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Abstract

We investigate the proximity effect in junctions between $N=3$ superconductors under commensurate voltage bias. The bias is chosen to highlight the role of transport processes that exchange multiple Cooper pairs coherently between more than two superconductors. Such non-local processes can be studied in the dc response, where local transport processes do not contribute. We focus on the proximity-induced normal density of states that we investigate in a wide parameter space. We reveal the presence of deep and highly tunable pseudogaps and other rich structures. These are due to a static proximity effect that is absent for $N=2$ and is sensitive to an emergent superconducting phase associated to non-local coherent transport. In comparison with results for $N=2$, we find similarities in the signature peaks of multiple Andreev reflections. We discuss the effect of electron-hole decoherence and of various types of junction asymmetries. Our predictions can be investigated experimentally using tunneling spectroscopy.

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Ciprian Padurariu, Thibaut Jonckheere, Jérôme Rech, Thierry Martin, Denis Feinberg. 2017-05-30. Tunable pseudogaps due to non-local coherent transport in voltage-biased three-terminal Josephson junctions. https://doi.org/10.1103/physrevb.95.205437

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