Gauss-Bonnet holographic superconductors in lower-dimensions

Abstract

We disclose the effect of Gauss-Bonnet gravity on the properties of holographic $s$-wave and $p$-wave superconductors with higher order corrections in lower-dimensional spacetime. We employ shooting method to solve equations of motion numerically and obtain the effect of different values of mass, nonlinear gauge field and Gauss-Bonnet parameters on critical temperature and condensation. Based on our results, increasing each of these three parameters leads to lower temperatures and larger values of condensation. This phenomenon is rooted in the fact that conductor/superconductor phase transition faces with difficulty for higher effect of nonlinear and Gauss-Bonnet terms in the presence of a massive field. In addition, we study the electrical conductivity in holographic setup. In $D=4$, real and imaginary parts of conductivity in holographic $s$- and $p$-wave models behave similarly and follow the same trend as higher dimensions by showing the delta function and pole at low frequency regime that Kramers-Kronig relation can connect these two parts of conductivity to each other. We observe the appearance of a gap energy at ${\omega }_g\approx 8T_c$ at which shifts toward higher frequencies by diminishing temperature and increasing the effect of nonlinear and Gauss-Bonnet terms. Conductivity in $D=3$ is far different from other dimensions. Even the real and imaginary parts in $s$- and $p$-wave modes pursue various trends. For example in $\omega \to 0$ limit, imaginary part in holographic $s$-wave model tends to infinity but in $p$-wave model approaches to zero. However, the real parts in both models show a delta function behavior. In general, real and imaginary parts of conductivity in all cases that we study tend to a constant value in $\omega \to \infty$ regime.

arXiv comment15 pages. arXiv admin note: substantial text overlap with arXiv:1908.07992

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Cited by in corpus (1)

• Higher-dimensional Holographic Superconductors in Born-Infeld Electrodynamics and f(R) Gravity