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1. chinaXiv:201612.00085 [pdf]

Competition between s-wave order and d-wave order in holographic superconductors

Li, Li-Fang; Cai, Rong-Gen; Li, Li; Wang, Yong-Qiang
Subjects: Geosciences >> Space Physics

We study competition between s-wave order and d-wave order through two holographic superconductor models. We find that once the coexisting phase appears, it is always thermodynamically favored, and that the coexistence phase is narrow and one condensate tends to kill the other. The phase diagram is constructed for each model in terms of temperature and the ratio of charges of two orders. We further compare the behaviors of some thermodynamic quantities, and discuss the different aspects and identical ones between two models.

submitted time 2016-12-22 Hits1658Downloads916 Comment 0

2. chinaXiv:201605.01167 [pdf]

Competition and coexistence of order parameters in holographic multi-band superconductors

Cai, Rong-Gen; Li, Li; Li, Li-Fang; Wang, Yong-Qiang;
Subjects: Physics >> The Physics of Elementary Particles and Fields

We construct a holographic multi-band superconductor model with each complex scalar field in the bulk minimally coupled to a same gauge field. Taking into account the back reaction of matter fields on the background geometry and focusing on the two band case with two scalar order parameters, we find that depending on the strength of the back reaction and the charge ratio of the two bulk scalars, five different superconducting phases exist, and three of five phases exhibit some region where both orders coexist and are thermodynamically favored. The other two superconducting phases have only one scalar order. The model exhibits rich phase structure and we construct the full diagram for the five superconducting phases. Our analysis indicates that the equivalent attractive interaction mediated by gravity between the two order parameters tends to make the coexistence of two orders much more easy rather than more difficult.

submitted time 2016-05-09 Hits1447Downloads754 Comment 0

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