Holographic superconductivity from higher derivative theory

Abstract

We construct a $6$ derivative holographic superconductor model in the $4$-dimensional bulk spacetimes, in which the normal state describes a quantum critical (QC) phase. The phase diagram $({\gamma }_1,{\hat{T}}_c)$ and the condensation as the function of temperature are worked out numerically. We observe that with the decrease of the coupling parameter ${\gamma }_1$, the critical temperature ${\hat{T}}_c$ decreases and the formation of charged scalar hair becomes harder. We also calculate the optical conductivity. An appealing characteristic is a wider extension of the superconducting energy gap, comparing with that of $4$ derivative theory. It is expected that this phenomena can be observed in the real materials of high temperature superconductor. Also the Homes' law in our present models with $4$ and $6$ derivative corrections is explored. We find that in certain range of parameters $\gamma$ and ${\gamma }_1$, the experimentally measured value of the universal constant $C$ in Homes' law can be obtained.

16 pages, 5 figures

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Cited by in corpus (2)

• p-wave holographic superconductor in scalar hairy black holes
• EM duality and Quasi-normal modes from higher derivatives with homogeneous disorder