Holographic superconductor on Q-lattice
Journal of High Energy Physics, ISSN: 1029-8479, Vol: 2015, Issue: 2
2015
- 58Citations
- 6Captures
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Article Description
We construct the simplest gravitational dual model of a superconductor on Q-lattices. We analyze the condition for the existence of a critical temperature at which the charged scalar field will condense. In contrast to the holographic superconductor on ionic lattices, the presence of Q-lattices will suppress the condensate of the scalar field and lower the critical temperature. In particular, when the Q-lattice background is dual to a deep insulating phase, the condensation would never occur for some small charges. Furthermore, we numerically compute the optical conductivity in the superconducting regime. It turns out that the presence of Q-lattice does not remove the pole in the imaginary part of the conductivity, ensuring the appearance of a delta function in the real part. We also evaluate the gap which in general depends on the charge of the scalar field as well as the Q-lattice parameters. Nevertheless, when the charge of the scalar field is relatively large and approaches the probe limit, the gap becomes universal with ω ≃ 9T which is consistent with the result for conventional holographic superconductors.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84922802120&origin=inward; http://dx.doi.org/10.1007/jhep02(2015)059; http://link.springer.com/10.1007/JHEP02(2015)059; http://link.springer.com/content/pdf/10.1007/JHEP02(2015)059; http://dx.doi.org/10.1007/jhep02%282015%29059; https://dx.doi.org/10.1007/jhep02%282015%29059; https://link.springer.com/article/10.1007/JHEP02(2015)059
Springer Nature
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