An anisotropic, single-axion holographic fluid is thermodynamically stable for all studied anisotropy and charge, with DC conductivity that vanishes at large anisotropy and passes through a metal-insulator transition.
General Relativity and the Cuprates
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We add a periodic potential to the simplest gravitational model of a superconductor and compute the optical conductivity. In addition to a superfluid component, we find a normal component that has Drude behavior at low frequency followed by a power law fall-off. Both the exponent and coefficient of the power law are temperature independent and agree with earlier results computed above $T_c$. These results are in striking agreement with measurements on some cuprates. We also find a gap $\Delta = 4.0\ T_c$, a rapidly decreasing scattering rate, and "missing spectral weight" at low frequency, all of which also agree with experiments.
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Thermodynamics and DC conductivity of 2D anisotropic fluids from axion holography
An anisotropic, single-axion holographic fluid is thermodynamically stable for all studied anisotropy and charge, with DC conductivity that vanishes at large anisotropy and passes through a metal-insulator transition.