부산대학교 도서관

We study numerically an $s$-wave holographic superconductor from an anti-de Sitter-Einstein-Born-Infeld black hole with backreaction in the context of the anti-de Sitter/conformal field theory (AdS/CFT) correspondence. By introducing a parameter $G$ to tune the effects of the backreaction, we can study non-perturbatively how the condensation and conductivity of the superconductor change as the backreaction increases. We find that for small values of $G$, increasing the nonlinearity of the Born-Infeld model makes the formation of the condensate harder -- consistent with previous results reported in the literature -- while for values of $G$ close to one, the opposite effect occurs; increasing the nonlinearity slightly facilitates its formation. This result is confirmed by making similar studies for the electrical conductivity of the superconductor and the penetration depth of the Meissner effect. Moreover, we analize in detail the superfluid density in these systems. We also determine how the ratio $ω_g/T_c$ varies for different intensities of nonlinearity and backreaction, showing in particular that large deviations from the so-called universal value arise as backreaction becomes stronger.
Added a section about the effects of backreaction and nonlinearity of the Born-Infeld model on the Meissner effect; 18 pages, 6 figures