Amplitude, density, and current correlations of strongly disordered superconductors

  • We investigate the disorder dependence of the static density, amplitude, and current correlations within the attractive Hubbard model supplemented with onsite disorder. It is found that strong disorder favors a decoupling of density and amplitude correlations due to the formation of superconducting (SC) islands. This emergent granularity also induces an enhancement of the density correlations on the SC islands whereas amplitude fluctuations are most pronounced in the “insulating” regions. While density and amplitude correlations are short ranged at strong disorder, we show that current correlations have a long-range tail due to the formation of percolative current paths in agreement with the constant behavior expected from the analysis of one-dimensional models.

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Author: Götz Seibold, Lara BenfattoORCiD, Claudio Castellani, José LorenzanaORCiD
URL:http://journals.aps.org/prb/abstract/10.1103/PhysRevB.92.064512
DOI:https://doi.org/10.1103/PhysRevB.92.064512
ISSN:2469-9969
Title of the source (English):Physical Review B
Document Type:Scientific journal article peer-reviewed
Language:English
Year of publication:2015
Volume/Year:92
Issue number:6
First Page:064512
Faculty/Chair:Fakultät 1 MINT - Mathematik, Informatik, Physik, Elektro- und Informationstechnik / FG Computational Physics
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