Dresden 2014 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 93: Superconductivity: (General) Theory
TT 93.6: Talk
Thursday, April 3, 2014, 17:45–18:00, HSZ 201
Electromagnetic response of strongly disordered superconductors — •Götz Seibold1, Lara Benfatto2, Claudio Castellani2, and Jose Lorenzana2 — 1BTU Cottbus-Senftenberg, Germany — 2University of Rome 'La Sapienza', Italy
By including fluctuations beyond the Bogoljubov-de Gennes approach we investigate the static and dynamical properties of current correlations in the attractive Hubbard model with strong on-site disorder. In the static limit we find a strong renormalization of the superfluid stiffness due to the occurence of quasi one-dimensional percolative current patterns which connect superconducting islands. Moreover we show that for strongly disordered superconductors phase modes acquire a dipole moment and appear as a subgap spectral feature in the optical conductivity.