Premium
Dynamic Field‐Theoretic Approach to a Disordered Model Superconductor
Author(s) -
Kolley E.,
Kolley W.
Publication year - 1989
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.19895010106
Subject(s) - saddle point , physics , formalism (music) , superconductivity , gaussian , path integral formulation , spinor , replica , effective action , saddle , hubbard model , statistical physics , parameter space , hamiltonian (control theory) , mathematical physics , quantum mechanics , theoretical physics , mathematics , mathematical optimization , art , musical , statistics , geometry , visual arts , quantum
On the basis of the attractive Hubbard model with a Gaussian random potential we describe superconductivity in the presence of quenched disorder. A dynamic path‐integral formalism with an 8‐component Keldysh‐Nambu spinor is shown to be convenient for solving the averaging problem without the recourse to the replica trick. The effective action is bosonized in terms of collective variables, namely local Q ‐matrices and real space pair fields. Saddle point values are calculated in two simplified limits.