Suppression of the "Quasiclassical" proximity gap in correlated-metal--superconductor structures.
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.
Nikolić
Branislav K
BK
Department of Physics, Georgetown University, Washington, DC 20057-0995, USA.
Freericks
J K
JK
Miller
P
P