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首页> 外文期刊>Physica, B. Condensed Matter >Current-conserving nonlinear response theory in driven systems
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Current-conserving nonlinear response theory in driven systems

机译:驱动系统中的电流守恒非线性响应理论

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摘要

Employing the closed-time path 2Pl effective action (CTP 2PI EA) approach, we study the response of an open interacting electronic system to time-dependent external electromagnetic fields. We show that the 2PI EA provides a systematic way of calculating the propagator and response functions of the system. Due to the invariance of the 2PI EA under external gauge transformations, the response functions calculated from it are such that the Ward-Takahashi hierarchy, which ensures current conservation beyond the expectation value level, is satisfied. These findings may be useful in the study of interacting electronic pumping devices, and serve to clarify the connection between current conservation (beyond the mean value level) and real-time nonlinear response theory.
机译:利用封闭时间路径2Pl有效动作(CTP 2PI EA)方法,我们研究了开放式交互电子系统对时间依赖的外部电磁场的响应。我们显示2PI EA提供了一种计算系统传播器和响应函数的系统方法。由于2PI EA在外部量规转换下的不变性,因此计算得出的响应函数可以满足Ward-Takahashi层次结构,该层次结构可确保电流守恒超出期望值水平。这些发现可能对相互作用的电子泵浦装置的研究很有用,并有助于阐明电流守恒(超出平均值水平)与实时非线性响应理论之间的联系。

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