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Dynamical vertex correction to the generalized Kadanoff-Baym Ansatz
- 1.0569325 - FZÚ 2024 RIV US eng J - Journal Article
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
R&D Projects: GA ČR(CZ) GA21-11089S
Institutional support: RVO:68378271
Keywords : quantum transport * general formulation of transport theory * electronic transport in mesoscopic systems
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 1.8, year: 2022
Method of publishing: Limited access
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.
Permanent Link: https://hdl.handle.net/11104/0346799
Number of the records: 1