Superfluid Density and Phase Relaxation in Superconductors with Strong Disorder

  • We consider the attractive Hubbard model with on-site disorder as a prototype of a disordered superconductor. We solve the Bogoliubov–de Gennes equations on two-dimensional finite clusters at zero temperature and evaluate the electromagnetic response to a vector potential. We find that the standard decoupling between transverse and longitudinal response does not apply in the presence of disorder. Moreover, the superfluid density is strongly reduced by the relaxation of the phase of the order parameter already at mean-field level when disorder is large. We also find that the anharmonicity of the phase fluctuations is strongly enhanced by disorder. Beyond mean field, this provides an enhancement of quantum fluctuations inducing a zero-temperature transition to a nonsuperconducting phase of disordered preformed pairs. Finally, the connection of our findings with the glassy physics for extreme dirty superconductors is discussed.

Export metadata

Additional Services

Search Google Scholar
Metadaten
Author: Götz Seibold, Lara BenfattoORCiD, Claudio Castellani, José LorenzanaORCiD
URL:http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.108.207004
DOI:https://doi.org/10.1103/PhysRevLett.108.207004
ISSN:1092-0145
Title of the source (English):Physical Review Letters
Document Type:Scientific journal article peer-reviewed
Language:English
Year of publication:2012
Volume/Year:108
Issue number:20
First Page:207004
Faculty/Chair:Fakultät 1 MINT - Mathematik, Informatik, Physik, Elektro- und Informationstechnik / FG Computational Physics
Einverstanden ✔
Diese Webseite verwendet technisch erforderliche Session-Cookies. Durch die weitere Nutzung der Webseite stimmen Sie diesem zu. Unsere Datenschutzerklärung finden Sie hier.