Effects of background rotation and anisotropy in the holographic description of type-II superconductors

TL;DR

This paper develops a holographic model of a type-II superconductor on an anisotropic rotating black hole, revealing how rotation influences condensate and conductivity, and models vortex lattice deformations under magnetic fields.

Contribution

It introduces a detailed holographic model incorporating rotation and anisotropy, linking black hole rotation to quasiparticle damping and modeling vortex lattice behavior under magnetic fields.

Findings

Rotation causes a peak and exponential decay in AC conductivity.

Vortex lattice deforms with magnetic field, matching experimental observations.

Model relates black hole rotation to quasiparticle damping effects.

Abstract

The present work concerns the detailed construction of a holographic model for a type-II s-wave superconductor defined on a 5-dimensional anisotropic rotating black hole. We examine the role of rotation and anisotropy on the properties of the superconductor model focusing on the condensate and the AC conductivity, for which we obtain closed formulas, using both analytical and numerical methods. The results reveal that the rotation is responsible for the appearance of a peak and for introducing an exponentially vanishing behavior in the high-frequency limit of the real component of the AC conductivity. Such a behavior aligns with that observed in high-temperature superconductor models and experiments, where the peak and vanishing behavior result from quasiparticle damping, suggesting a relation between the {\it rotation of a black hole} and {\it quasiparticle damping effects} due to impurities or defects in a superconducting material. This relation supplements the holographic dictionary of the gravity/Condensed Matter Theory correspondence. In addition, we provide a detailed construction of the vortex lattice presented in arXiv:2208.05988 and study its behavior as a function of an external uniform magnetic field. Once again, it is shown that the vortex lattice can be continuously deformed along with a change in the vortex population by virtue of the magnetic field, providing a promising avenue for holographically modeling the vortex lattice deformations observed in experimental studies with superconducting materials. As a concrete example, we describe both the vortex lattice deformation and the increment of the vortex population under the action of an external magnetic field in the LiFeAs type-II superconductor. These effects supplement those previously found for the FeSe type-II superconductor studied in arXiv:2208.05988.