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Title: Phenomenological models of holographic superconductors and hall currents
Author: Aprile, Francesco
Franco, Sebastián
Rodríguez Gómez, Diego
Russo, J. G. (Jorge Guillermo)
Keywords: Camps de galga (Física)
Física matemàtica
Gauge fields (Physics)
Mathematical physics
Issue Date: 2010
Publisher: Springer; Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Abstract: We study general models of holographic superconductivity parametrized by four arbitrary functions of a neutral scalar field of the bulk theory. The models can accommodate several features of real superconductors, like arbitrary critical temperatures and critical exponents in a certain range, and perhaps impurities or boundary or thickness effects. We find analytical expressions for the critical exponents of the general model and show that they satisfy the Rushbrooke identity. An important subclass of models exhibit second order phase transitions. A study of the specific heat shows that general models can also describe holographic superconductors undergoing first, second and third (or higher) order phase transitions. We discuss how small deformations of the HHH model can lead to the appearance of resonance peaks in the conductivity, which increase in number and become narrower as the temperature is gradually decreased, without the need for tuning mass of the scalar to be close to the Breitenlohner-Freedman bound. Finally, we investigate the inclusion of a generalized ¿theta term¿ producing Hall effect without magnetic field.
Note: Reproducció del document publicat a:
It is part of: Journal of High Energy Physics, 2010, vol. 5, núm. 102
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ISSN: 1029-8479
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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