Holographic disorder driven superconductor-metal transition
D. Areán, L. A. Pando Zayas, I. Salazar Landea, A. Scardicchio
DOI 10.1103/PhysRevD.94.106003 · Physical Review D
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Abstract
We implement the effects of disorder on a holographic superconductor by introducing a random chemical potential on the boundary. We demonstrate explicitly that increasing disorder leads to the formation of islands where the superconducting order is enhanced and subsequently to the transition to a metal. We study the behavior of the superfluid density and of the conductivity as a function of the strength of disorder. We find explanations for various marked features in the conductivities in terms of hydrodynamic quasinormal modes of the holographic superconductors. These identifications plus a particular disorder-dependent spectral weight shift in the conductivity point to a signature of the Higgs mode in the context of disordered holographic superconductors. We observe that the behavior of the order parameter close to the transition is not mean-field type as in the clean case; rather we find robust agreement with exp(−A|T−Tc|−ν), with ν=1.03±0.02 for this disorder-driven smeared transition.
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