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Bifundamental superfluids from holography

Open Access
Regular Article - Theoretical Physics

Abstract

We study the holographic dual of a (2 + 1)-dimensional s-wave superfluid that breaks an abelian U(1) × U(1) global symmetry group to the diagonal U(1) V . The model is inspired by Sen’s tachyonic action, and the operator that condenses transforms in the bifundamental representation of the symmetry group. We focus on two configurations: the first one describes a marginal operator, and the phase diagram at finite temperature contains a first or a second order phase transition, depending on the parameters that determine the theory. In the second model the operator is relevant and the finite temperature transitions are always second order. In the latter case the conductivity for the current associated to the broken symmetry shows quasiparticle excitations at low temperatures, with mass given by the width of the superconducting gap. The suppression of spectral weight at low frequencies is also observed in the conductivity associated to the conserved symmetry, for which the DC value decreases as the temperature is reduced.

Keywords

Gauge-gravity correspondence Holography and condensed matter physics (AdS/CMT) D-branes AdS-CFT Correspondence 

Notes

Open Access

This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

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Copyright information

© The Author(s) 2015

Authors and Affiliations

  1. 1.Max-Planck-Institut für Physik (Werner-Heisenberg-Institut)MunichGermany
  2. 2.Departament de Física Fonamental and Institut de Ciències del CosmosUniversitat de BarcelonaBarcelonaSpain

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