Building an AdS/CFT superconductor

@inproceedings{Hartnoll2008BuildingAA,
  title={Building an AdS/CFT superconductor},
  author={Sean A. Hartnoll and Christopher P. Herzog and Gary T. Horowitz},
  year={2008}
}
We show that a simple gravitational theory can provide a holographically dual description of a superconductor. There is a critical temperature, below which a charged condensate forms via a second order phase transition and the (DC) conductivity becomes infinite. The frequency dependent conductivity develops a gap determined by the condensate. We find evidence that the condensate consists of pairs of quasiparticles. 
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