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arXiv 0810.3970hep-thcond-mat.supr-congr-qc
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全息π超流体D3/D7的超导性

Superconductivity from D3/D7: Holographic Pion Superfluid

Pallab Basu, Jianyang He, Anindya Mukherjee, Hsien-Hang Shieh

摘要:

我们证明了一个D3/D 7系统(零夸克质量极限)在有限的同位旋化学势下经历一个类似超导(超流体)的相变。这类似于QCD文献中研究的调味超流相,其中介子算子凝聚。我们研究了凝聚体的电导率随频率的变化,发现在零频率极限处有一个δ函数极点。这是弦论中超导性的一个例子。因此,我们已经找到了一个超流/超流型的解决方案,并研究了相关的相图。在临界超流速度下,超导转变从二阶转变为一阶。我们已经研究了超导系统的各种性质,如超流密度,能隙,第二声等。我们调查的可能性,同位旋化学势修改嵌入的味膜检查是否横向标量也凝聚在低温下。然而,情况似乎并非如此。

英文摘要:

We show that a D3/D7 system (at zero quark mass limit) at finite isospin chemical potential goes through a superconductor (superfluid) like phase transition. This is similar to a flavored superfluid phase studied in QCD literature, where mesonic operators condensate. We have studied the frequency dependent conductivity of the condensate and found a delta function pole in the zero frequency limit. This is an example of superconductivity in a string theory context. Consequently we have found a superfluid/supercurrent type solution and studied the associated phase diagram. The superconducting transition changes from second order to first order at a critical superfluid velocity. We have studied various properties of the superconducting system like superfluid density, energy gap, second sound etc. We investigate the possibility of the isospin chemical potential modifying the embedding of the flavor branes by checking whether the transverse scalars also condense at low temperature. This however does not seem to be the case.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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