Conductivity of the holographic p-wave superconductors with higher order corrections

TL;DR

This paper studies holographic p-wave superconductors with higher order gravity and gauge field corrections, analyzing how these modifications affect critical temperature, conductivity, and superconducting properties.

Contribution

It introduces a combined analysis of Gauss-Bonnet gravity and nonlinear gauge field corrections in holographic p-wave superconductors, exploring their impact on phase transition and conductivity.

Findings

Increasing mass and nonlinearity decreases critical temperature.

Stronger Gauss-Bonnet parameter suppresses superconductivity.

Conductivity exhibits a delta function and pole, with gap frequency affected by parameters.

Abstract

We investigate the holographic $p$-wave superconductors in the presence of the higher order corrections on the gravity as well as on the gauge field side. On the gravity side, we add the Gauss-Bonnet curvature correction terms, while on the gauge field side we take the nonlinear Lagrangian in the form $F + b F^2$, where F is the Maxwell Lagrangian and b indicates the strength of nonlinearity. We employ the shooting method for the numerical calculations in order to obtain the ratio of the critical temperature $T_c$ over $\rho^ {1/(d-2)}$. We observe that by increasing the values of the mass and the nonlinear parameters the critical temperature decreases and thus the condensation becomes harder to form. In addition, the stronger Gauss-Bonnet parameter $\alpha$ hinders the superconducting phase in Gauss-Bonnet gravity. Furthermore, we calculate the electrical conductivity based on the holographic setup. The real and imaginary parts are related to each other by Kramers-Kronig relation which indicates a delta function and pole in low frequency regime, respectively. However, at enough large frequencies the trend of real part can be interpreted by $Re[\sigma] = \omega^{(d-4)}$. Moreover, in holographic model the ratio $\omega_g/T_c$ is always much larger than the BCS value $3.5$ due to the strong coupling of holographic superconductors. In both gravity kinds, decreasing the temperature or increasing the effect of nonlinearity shifts the gap frequency toward larger values. Besides, the gap frequency is occurred at larger values by enlarging the Gauss-Bonnet parameter. In general, the behavior of conductivity depends on the choice of the mass, the nonlinear and the Gauss-Bonnet parameters.