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arXiv 0810.2316hep-thcond-mat.supr-conhep-phnucl-th
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规范/引力对偶的超导性

Superconductivity from gauge/gravity duality with flavor

Martin Ammon, Johanna Erdmenger, Matthias Kaminski, Patrick Kerner

摘要:

我们考虑热强耦合N=2 SYM理论与基本物质在有限的同位旋化学势。利用规范/引力对偶,即嵌入在AdS黑洞背景中的两个味D 7-膜的探针,我们找到了系统发生二级相变的临界温度.这种转变的临界指数为1/2,与平均场论的结果一致。在最有利的阶段,味电流获得一个vev和破坏阿贝尔对称性自发。这个新的相位显示了超导性的特征,例如无限的直流电导率和频率依赖电导率中的间隙。重力设置允许明确识别的自由度在双场论,以及为双弦图片的凝聚过程。

英文摘要:

We consider thermal strongly-coupled N=2 SYM theory with fundamental matter at finite isospin chemical potential. Using gauge/gravity duality, i.e. a probe of two flavor D7-branes embedded in the AdS black hole background, we find a critical temperature at which the system undergoes a second order phase transition. The critical exponent of this transition is one half and coincides with the result from mean field theory. In the thermodynamically favored phase, a flavor current acquires a vev and breaks an Abelian symmetry spontaneously. This new phase shows signatures known from superconductivity, such as an infinite dc conductivity and a gap in the frequency-dependent conductivity. The gravity setup allows for an explicit identification of the degrees of freedom in the dual field theory, as well as for a dual string picture of the condensation process.

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