Suppression of the "quasiclassical" proximity gap in correlated-metal--superconductor structures

Details Suppression of the "quasiclassical" proximity gap in correlated-metal--superconductor structures Suppression of the "quasiclassical" proximity gap in correlated-metal--superconductor structures

2001-06-28

arxiv.org/abs/cond-mat/0106612v2

Phys. Rev. Lett. 88, 077002 (2002).

Physics

Condensed Matter

Superconductivity

5 pages, 3 embedded EPS figures; some issues clarified with new result presented in the inset of Fig. 1

Scientific paper

10.1103/PhysRevLett.88.077002

We study the energy and spatial dependence of the local density of states in a superconductor--correlated-metal--superconductor Josephson junction, where the correlated metal is a non-Fermi liquid (described by the Falicov-Kimball model). Many-body correlations are treated with dynamical mean-field theory, extended to inhomogeneous systems. While quasiclassical theories predict a minigap in the spectrum of a disordered Fermi liquid which is proximity-coupled within a mesoscopic junction, we find that increasing electron correlations destroy any minigap that might be opened in the absence of many-body correlations.

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