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Generalized Langreth rules

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Original languageEnglish
Article number165408
JournalPhysical Review B
Volume101
Issue number16
DOIs
Publication statusPublished - 15 Apr 2020

King's Authors

Abstract

We derive a set of rules for transforming integrals over the time contour met in the theory of nonequilibrium Green's functions (NEGF) into usual integrals over the real and imaginary times for the case when the system's Hamiltonian is different on each track. This situation is encountered, e.g., in the influence functional formalism of the path integrals theory when integrating over all trajectories associated with a part of a system.

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