Strong Nonequilibrium Coherent States in Mesoscopic Superconductor-Semiconductor-Superconductor Junctions View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1999-12

AUTHORS

J. Kutchinsky, M. Wildt, R. Taboryski, O. Kuhn, C. B. Sørensen, J. Bindslev Hansen, P. E. Lindelof

ABSTRACT

A biased superconductor-normal metal-superconductor junction is known to be a strong nonequilibrium system, where Andreev scattering at the interfaces creates a quasiparticle distribution function far from equilibrium. A manifestation of this is the well-known subgap structure in the I/V characteristic, with peaks in the conductance at V = 2Δ/ne. We study an SNS structure consisting of highly doped diffusive GaAs with superconducting electrodes of aluminum with one electrode configured as a flux-sensitive interferometer. This enables us to probe the coherent nature of the quasiparticle states at subgap bias voltage. Oscillations in the conductance as a function of flux are seen at zero bias voltage and disappear below experimental resolution as the bias voltage exceeds the Thouless energy Et = ħD/L2, where L is the junction length. The oscillations reappear at higher bias in a region around the superconducting energy gap V = Δ/e corresponding to the subgap conductance peak n = 2. More... »

PAGES

839-842

Identifiers

URI

http://scigraph.springernature.com/pub.10.1023/a:1007757715089

DOI

http://dx.doi.org/10.1023/a:1007757715089

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1052458603


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