Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2011-09-08
Physics
Condensed Matter
Disordered Systems and Neural Networks
6 pages, 5 figures
Scientific paper
We show that the presence of a spin-dependent random potential in a superconductor or a superfluid atomic gas leads to distinct transitions at which the energy gap and average order parameter vanish, generating an intermediate gapless superfluid phase, in marked contrast to the case of spin-symmetric randomness where no such gapless superfluid phase is seen. By allowing the pairing amplitude to become inhomogeneous, the gapless superconducting phase persists to considerably higher disorder compared with the prediction of Abrikosov-Gorkov. The low-lying excited states are located predominantly in regions where the pairing amplitude vanishes and coexist with the superfluid regions with a finite pairing. Our results are based on inhomogeneous Bogoliubov-de Gennes mean field theory for a two dimensional attractive Hubbard model with spin-dependent disorder.
Batrouni Ghassan George
Jiang Mingming
Nanguneri R.
Scalettar Richard T.
Trivedi Nandini
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