Dynamical vertex correction to the generalized Kadanoff-Baym Ansatz

0569325 - FZÚ 2024 RIV US eng J - Článek v odborném periodiku
Kalvová, Anděla - Špička, Václav - Velický, Bedřich - Lipavský, P.
Dynamical vertex correction to the generalized Kadanoff-Baym Ansatz.
EPL. Roč. 141, č. 1 (2023), č. článku 16002. ISSN 0295-5075. E-ISSN 1286-4854
Grant CEP: GA ČR(CZ) GA21-11089S
Institucionální podpora: RVO:68378271
Klíčová slova: quantum transport * general formulation of transport theory * electronic transport in mesoscopic systems
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 1.8, rok: 2022
Způsob publikování: Omezený přístup
https://doi.org/10.1209/0295-5075/acad9b

The Generalized Kadanoff-Baym Ansatz, used to simplify the non-equilibrium Green's functions to the kinetic equation for the density matrix, leads to an incorrect dynamics of a system if the selfenergy has a rich energy spectrum. We propose an approximation of the vertex correction which dynamically changes with the density matrix while it benefits from simplicity of stationary propagators. On the molecular bridge between ferromagnetic leads, we demonstrate that this simple vertex fixes the failure of the kinetic equation on a negligible computational cost.
Trvalý link: https://hdl.handle.net/11104/0346799