Attractive Hubbard Model: Homogeneous Ginzburg - Landau Expansion and Disorder

E. Z. Kuchinskii, N. A. Kuleeva, M. V. Sadovskii

We derive Ginzburg - Landau (GL) expansion in disordered attractive Hubbard model within the combined Nozieres - Schmitt-Rink and DMFT+Sigma approximation. Restricting ourselves to…