Condensate entanglement and multigap superconductivity in nanoscale superconductors

Details Condensate entanglement and multigap superconductivity in nanoscale superconductors Condensate entanglement and multigap superconductivity in nanoscale superconductors

2010-06-24

arxiv.org/abs/1006.4747v1

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

A Green functions approach is used to study superconductivity in nanofilms and nanowires. We show that the superconducting condensate results from the multimodal entanglement, or internal Josephson coupling, of the subcondensates associated with the manifold of Fermi surface subparts resulting from size-quantisation. This entanglement is of critical importance in these systems, since without it superconductivity would be extremely weak, if not completely negligible. Further, the multimodal character of the condensate generally results in multigap superconductivity, with great quantitative consequence for the value of the critical parameters. Our approach suggests that these are universal characteristics of confined superconductors.

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