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- W2049718806 abstract "Abstract Employing the closed-time path 2PI 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." @default.
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- W2049718806 date "2009-10-01" @default.
- W2049718806 modified "2023-10-18" @default.
- W2049718806 title "Current-conserving nonlinear response theory in driven systems" @default.
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- W2049718806 doi "https://doi.org/10.1016/j.physb.2009.06.112" @default.
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