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Ward identity for non-equilibrium Fermi systems
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SYSNO ASEP 0306507 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Ward identity for non-equilibrium Fermi systems Title Wardova identita pro nerovnovážné Fermiho systémy Author(s) Velický, B. (CZ)
Kalvová, Anděla (FZU-D) RID, ORCID
Špička, Václav (FZU-D) RID, ORCIDSource Title Physical Review. B - ISSN 1098-0121
Roč. 77, č. 4 (2008), 041201/1-041201/4Number of pages 4 s. Language eng - English Country US - United States Keywords non-equilibrium ; Green’s functions ; quantum transport equations ; Ward identity Subject RIV BE - Theoretical Physics R&D Projects GC202/07/J051 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z10100520 - FZU-D (2005-2011) AV0Z10100521 - FZU-D (2005-2011) UT WOS 000252863100002 DOI 10.1103/PhysRevB.77.041201 Annotation A nonequilibrium Ward identity (NE WI) connecting the scalar transport vertex correction with one-particle self-energy is derived using the global U(1) symmetry of the fermion nonequilibrium Green’s functions (NGF). The nonperturbative derivation does not depend on the details of the many-body system. A renormalized multiplicative composition rule for the NGF, reflecting time coherence, is obtained and related to the NE WI. Applications involve (i) testing the consistency of approximations shown in the example of a self-consistent Born approximation for disorder scattering, and (ii) in the general quantum transport theory, the formalism permits one to assess routes to generalized master equations, in particular those based on the generalized Kadanoff-Baym ansatz. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2012
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