Articulo
Holographic Type II Goldstone bosons
Registro en:
issn:1029-8479
Autor
Amado, Irene
Areán, Daniel
Jimenez Alba, Amadeo
Landsteiner, Karl
Melgar, Luis
Salazar Landea, Ignacio
Institución
Resumen
The Goldstone theorem implies the appearance of an ungapped mode whenever a continuous global symmetry is spontaneously broken. In general it does not say anything about the precise form of the dispersion relation nor does it imply that there is one massless mode for each broken symmetry generator. It is a well-established fact that even for relativistic field theories in the presence of a chemical potential Goldstone modes with quadratic dispersion relation, the type II Goldstone bosons, appear in the spectrum. We develop two holographic models that feature type II Goldstone modes as part of the quasinormal mode spectrum. The models are based on simple generalizations with U(2) symmetry of the well-studied holographic s-wave superfluid. Our results include Goldstone modes without broken generators but with unusual realization of symmetries and a frequency dependent conductivity of striking resemblance to the one of Graphene. Instituto de Física La Plata
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