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A holographic study on vector condensate induced by a magnetic field


We study a holographic model with vector condensate by coupling the anti-de Sitter gravity to an Abelian gauge field and a charged vector field in (3 + 1) dimensional spacetime. In this model there exists a non-minimal coupling of the vector field to the gauge field. We find that there is a critical temperature below which the charged vector condenses via a second order phase transition. The DC conductivity becomes infinite and the AC conductivity develops a gap in the condensed phase. We study the effect of a background magnetic field on the system. It is found that the background magnetic field can induce the condensate of the vector field even in the case without chemical potential/charge density. In the case with non-vanishing charge density, the transition temperature raises with the applied magnetic field, and the condensate of the charged vector operator forms a vortex lattice structure in the spatial directions perpendicular to the magnetic field.
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Recommended references: Cai, Rong-Gen,He, Song,Li, Li,Li, Li-Fang.(2016).A holographic study on vector condensate induced by a magnetic field.JOURNAL OF HIGH ENERGY PHYSICS.[ChinaXiv:201612.00088] (Click&Copy)
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[V1] 2016-12-22 14:19:11 chinaXiv:201612.00088V1 Download
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