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arXiv 1609.09054hep-thcond-mat.mes-hallhep-phnucl-th
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全息术的反常输运:II部分

Anomalous transport from holography: Part II

Yanyan Bu, Michael Lublinsky, Amir Sharon

摘要:

本文是在Schwarzschild- $AdS_5$时空中由反常$U(1)_V\times U(1)_A$ Maxwell理论组成的全息模型中手征反常诱导输运的第二次研究。在第一部分中,手性磁/分离效应(CME/CSE)被认为是在静态空间不均匀的外部磁场的存在下。梯度校正CME/CSE分析评估到三阶导数展开。一些三阶梯度校正导致对扩散常数的异常诱导的负$B^2$校正。我们还发现非线性的$B$修改的手征磁波(CMW)。在第二部分中,我们集中在实验有趣的情况下,轴向化学势被动态诱导由一个恒定的磁场和时间相关的电场。矢量/轴向电流的本构关系计算采用两种不同的近似:(a)导数展开(高达三阶),但完全非线性的外部领域,和(b)弱电场限制,但恢复所有订单的导数展开。在第一种情况下,发现非零非线性轴向电流(CSE)。第二部分探讨了线性输运系数函数对磁场和频率的依赖性。

英文摘要:

This is a second study of chiral anomaly induced transport within a holographic model consisting of anomalous $U(1)_V\times U(1)_A$ Maxwell theory in Schwarzschild-$AdS_5$ spacetime. In the first part, chiral magnetic/separation effects (CME/CSE) are considered in presence of a static spatially-inhomogeneous external magnetic field. Gradient corrections to CME/CSE are analytically evaluated up to third order in the derivative expansion. Some of the third order gradient corrections lead to an anomaly-induced negative $B^2$-correction to the diffusion constant. We also find non-linear in $B$ modifications to the chiral magnetic wave (CMW). In the second part, we focus on the experimentally interesting case of the axial chemical potential being induced dynamically by a constant magnetic and time-dependent electric fields. Constitutive relations for the vector/axial currents are computed employing two different approximations: (a) derivative expansion (up to third order) but fully nonlinear in the external fields, and (b) weak electric field limit but resuming all orders in the derivative expansion. A non-vanishing non-linear axial current (CSE) is found in the first case. Dependence on magnetic field and frequency of linear transport coefficient functions (TCFs) is explored in the second.

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