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pwave Holographic Superconductors and fivedimensional gauged Supergravity
 JHEP
, 2011
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Extremal black brane solutions in fivedimensional gauged supergravity,” arXiv:1211.0832 [hepth
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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 falloff. Both the exponent and coefficient of ..."
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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 falloff. Both the exponent and coefficient of the power law are temperature independent and agree with earlier results computed above Tc. These results are in striking agreement with measurements on some cuprates. We also find a gap ∆ = 4.0 Tc, a rapidly decreasing scattering rate, and “missing spectral weight ” at low frequency, all of which also agree with experiments. 1 ar X iv
A Holographic Josephson Junction
"... We construct a gravitational dual of a Josephson junction. Calculations on the gravity side reproduce the standard relation between the current across the junction and the phase difference of the condensate. We also study the dependence of the maximum current on the temperature and size of the junct ..."
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We construct a gravitational dual of a Josephson junction. Calculations on the gravity side reproduce the standard relation between the current across the junction and the phase difference of the condensate. We also study the dependence of the maximum current on the temperature and size of the junction and reproduce familiar results. ar X iv
TIME DEPENDENT HOLOGRAPHY
"... This Doctoral Dissertation is brought to you for free and open access by the Physics and Astronomy at UKnowledge. It has been accepted for inclusion in Theses and DissertationsPhysics and Astronomy by an authorized administrator of UKnowledge. For more information, please contact ..."
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This Doctoral Dissertation is brought to you for free and open access by the Physics and Astronomy at UKnowledge. It has been accepted for inclusion in Theses and DissertationsPhysics and Astronomy by an authorized administrator of UKnowledge. For more information, please contact
Holographic superfluidity . . .
, 2011
"... We construct superfluid black hole solutions with two chemical potentials. By analogy with QCD, the two chemical potentials correspond to the baryon and isospin symmetries, respectively. We consider two systems: the backreacted U(2) EinsteinYangMills theory in 4+1 dimensions and the 9+1dimensi ..."
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We construct superfluid black hole solutions with two chemical potentials. By analogy with QCD, the two chemical potentials correspond to the baryon and isospin symmetries, respectively. We consider two systems: the backreacted U(2) EinsteinYangMills theory in 4+1 dimensions and the 9+1dimensional D3/D7 brane setup with two coincident D7brane probes. In the D7brane model, the identification of baryon and isospin chemical potential is explicit since the dual field theory is explicitly known. Studying the phase diagram, we find in both systems a quantum phase transition at a critical ratio of the two chemical potentials. However the quantum phase transition is different in the two systems: In the D3/D7 brane setup we always find a second order phase transition, while in the EinsteinYangMills theory, depending on the strength of the backreaction, we obtain a continuous or first order transition. We expect the continuous quantum phase transition to be BKTlike. We comment on the origin of this differing behavior in these apparently very similar models and compare to phenomenological systems.