Coulomb Drag in Normal Metals and Superconductors: Diagrammatic Approach

Details Coulomb Drag in Normal Metals and Superconductors: Diagrammatic Approach Coulomb Drag in Normal Metals and Superconductors: Diagrammatic Approach

1995-04-13

arxiv.org/abs/cond-mat/9504057v1

Physics

Condensed Matter

15 double--pages, self--extracting compressed ps file, landscape format

Scientific paper

10.1103/PhysRevB.52.7516

The diagrammatic linear response formalism for the Coulomb drag in two--layer systems is developed. This technique can be used to treat both elastic disorder and intralayer interaction effects. In the absence of intralayer electron--electron correlations we reproduce earlier results, obtained using the kinetic equation and the memory--function formalism. In addition we calculate weak--localization corrections to the drag coefficient and the Hall drag coefficient in a perpendicular magnetic field. As an example of the intralayer interaction effects we consider a situation where one (or both) layers are close to (but above) the superconducting transition temperature. Fluctuation corrections, analogous to the Aslamazov--Larkin corrections, to the drag coefficient are calculated. Although the fluctuation corrections do not enhance the drag coefficient for normal--superconductor systems, a dramatic enhancement is found for superconductor--superconductor structures.

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