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arXiv 0905.3918cond-mat.supr-concond-mat.mes-hall
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含杂质手征px+ipy超导体反常霍尔电导率的频率和温度依赖性

Frequency and temperature dependence of the anomalous Hall conductivity in a chiral px+ipy superconductor with impurities

Roman M. Lutchyn, Pavel Nagornykh, Victor M. Yakovenko

摘要:

我们计算了在没有外加磁场的情况下,具有自发时间反转对称性破缺的手征px+ipy超导体(如Sr2RuO4)中杂质散射引起的反常交流霍尔电导率的频率和温度依赖性.我们考虑两种模型的无序,高斯和非高斯,其特征在于由随机杂质势的二阶和三阶矩,分别。在这两个模型中,我们发现反常霍尔电导率在零频率处有一个有限的实值,在超导能隙的光子吸收阈值处表现出奇异性,并随高频Ω的某个幂次衰减。在超导转变温度以下,霍尔电导率随温度的降低而线性增加,并在零温处达到饱和。使用我们的高频霍尔电导率的结果,我们估计了材料的光反射的极克尔角,并将其与Xia等人在Sr2RuO4中的实验测量进行比较,物理修订版信函97,167002(2006)。

英文摘要:

We calculate frequency and temperature dependence of the anomalous ac Hall conductivity induced by impurity scattering in a chiral px+ipy superconductor, such as Sr2RuO4, with spontaneous time-reversal-symmetry breaking in the absence of an external magnetic field. We consider two models of disorder, Gaussian and non-Gaussian, characterized by the second and third moments of the random impurity potential, respectively. Within both models, we find that the anomalous Hall conductivity has a finite real value at zero frequency, exhibits singularities at the threshold of photon absorption across the superconducting gap, and decays as some power of the high frequency Ω. The Hall conductivity increases linearly with the decrease of temperature below the superconducting transition and saturates at zero temperature. Using our results for the high-frequency Hall conductivity, we estimate the polar Kerr angle for light reflection from the material and compare it with the experimental measurements in Sr2RuO4 by Xia et al., Phys. Rev. Lett. 97, 167002 (2006).

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