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arXiv 0809.3079hep-thgr-qc
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AdS/CFT超导体的特征长度

Characteristic length of an AdS/CFT superconductor

Kengo Maeda, Takashi Okamura

摘要:

我们更详细地研究了Hartnoll,Herzog和Horowitz最近发现的超导体的全息模型[Phys. Rev. Lett. 101,031601],其由AdS_4-Schwarzschild背景中的带电标量场的凝聚构造。通过对临界温度Tc附近引力系统扰动的解析研究,利用AdS/CFT对应,得到了超导相干长度与1/ \sqrt{1-T/T_c}成正比.通过在系统中加入一个小的均匀外磁场,我们发现在该磁场的作用下,系统会感应出一个与序参量的平方成正比的稳态反磁电流。这些结果与Ginzburg-Landau理论一致,并支持了超导体可以用黑洞上的带电标量场通过AdS/CFT对偶来描述的观点.

英文摘要:

We investigate in more detail the holographic model of a superconductor recently found by Hartnoll, Herzog, and Horowitz [Phys. Rev. Lett. 101, 031601], which is constructed from a condensate of a charged scalar field in AdS_4-Schwarzschild background. By analytically studying the perturbation of the gravitational system near the critical temperature T_c, we obtain the superconducting coherence length proportional to 1/\sqrt{1-T/T_c} via AdS/CFT correspondence. By adding a small external homogeneous magnetic field to the system, we find that a stationary diamagnetic current proportional to the square of the order parameter is induced by the magnetic field. These results agree with Ginzburg-Landau theory and strongly support the idea that a superconductor can be described by a charged scalar field on a black hole via AdS/CFT duality.

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