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arXiv 2407.07578cond-mat.mes-hallcond-mat.str-elhep-th
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具有伽利略不变性的量子霍尔系统的普适非线性响应

Universal nonlinear responses of quantum Hall systems with Galilean invariance

Tatsuya Amitani, Yusuke Nishida

AI总结:

本文研究了具有伽利略不变性的量子霍尔系统在磁场下的非线性响应,构造了满足所有对称性的最一般有效作用量,揭示了不同响应间的普适关系,发现霍尔电导率决定非零频率纵向电导率,霍尔粘度影响非零波数非线性电热导率。

摘要:

我们研究了在磁场下具有能隙且满足伽利略不变性的二维系统。当这类量子霍尔系统与电荷、能量和动量流的外部源耦合时,它们在 Milne boost 以及规范变换和广义坐标变换下均表现出不变性。我们构造了在导数展开中与所有对称性一致的最一般有效作用量,其中电场被视为一阶量,从而允许非线性响应。结果表明,所得作用量由四项组成,分别与霍尔电导率、霍尔粘度、能量密度和磁化强度成正比。随后,我们计算了由电磁场诱导的局域流,揭示了不同类型响应之间的普适关系。特别地,我们发现霍尔电导率决定了非零频率下的纵向电导率,而霍尔粘度则对非零波数下的非线性电热导率有贡献。

英文摘要:

We study two-dimensional systems with Galilean invariance gapped under magnetic fields. When such quantum Hall systems are coupled with external sources for charge, energy, and momentum currents, they exhibit invariance under the Milne boost as well as under the gauge and general coordinate transformations. We construct the most general effective action consistent with all the symmetries in the derivative expansion, where an electric field is regarded as order of unity so as to allow for nonlinear responses. The resulting action is shown to consist of four terms proportional to the Hall conductivity and viscosity and the energy density and magnetization. We then compute the local currents induced by electromagnetic fields, revealing universal relations among distinct kinds of responses. In particular, we find the Hall conductivity determining the longitudinal conductivity at nonzero frequency and the Hall viscosity contributing to the nonlinear electrothermal conductivity at nonzero wave number.

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