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arXiv 1208.4582hep-thcond-mat.str-elcond-mat.supr-con
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全息超导体中的FFLO态

FFLO States in Holographic Superconductors

James Alsup, Eleftherios Papantonopoulos, George Siopsis

摘要:

讨论了强耦合超导体中FFLO态的引力对偶。引力理论利用两个U(1)规范场和一个耦合到带电AdS黑洞的标量场。第一规范场与标量耦合,在临界温度以下产生电荷凝聚,第二规范场包含耦合到边界理论中的自旋的磁场。标量在第二规范场下是中性的。通过在第二个U(1)场和标量场之间引入磁相互作用,我们发现在高场极限下,非均匀解具有比均匀解更高的临界温度,从而导致接近零温度的FFLO态.

英文摘要:

We discuss the gravity dual of FFLO states in strongly coupled superconductors. The gravitational theory utilizes two U(1) gauge fields and a scalar field coupled to a charged AdS black hole. The first gauge field couples with the scalar sourcing a charge condensate below a critical temperature, and the second gauge field incorporates a magnetic field that couples to spin in the boundary theory. The scalar is neutral under the second gauge field. By turning on a magnetic interaction between the second U(1) field and the scalar, it is shown that, in the high-field limit, an inhomogeneous solution possesses a higher critical temperature than the homogeneous case, giving rise to FFLO states close to zero temperature.

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