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Generalized Langreth rules

Research output: Contribution to journalArticle

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

King's Authors


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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