Počet záznamů: 1
Mean-field approximation for thermodynamic and spectral functions of correlated electrons: strong coupling and arbitrary band filling
- 1.0482157 - FZÚ 2018 RIV US eng J - Článek v odborném periodiku
Janiš, Václav - Pokorný, Vladislav - Kauch, Anna
Mean-field approximation for thermodynamic and spectral functions of correlated electrons: strong coupling and arbitrary band filling.
Physical Review B. Roč. 95, č. 16 (2017), s. 1-12, č. článku 165113. ISSN 2469-9950. E-ISSN 2469-9969
Grant CEP: GA ČR GA15-14259S
Institucionální podpora: RVO:68378271
Klíčová slova: parquet equations * Hubbard model * self-consistency
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 3.813, rok: 2017
We present a construction of a mean-field theory for thermodynamic and spectral properties of correlated electrons reliable in the strong-coupling limit. We introduce an effective interaction determined self-consistently from the reduced parquet equations. It is a static local approximation of the two-particle irreducible vertex, the kernel of a potentially singular Bethe-Salpeter equation. The effective interaction enters the Ward identity from which a thermodynamic self-energy, renormalizing the one-electron propagators, is determined. The dynamical Schwinger-Dyson equation with the thermodynamic propagators is then used to calculate the spectral properties. The thermodynamic and spectral properties of correlated electrons are in this way determined on the same footing and in a consistent manner. Such a mean-field approximation is analytically controllable and free of unphysical behavior and spurious phase transitions.
Trvalý link: http://hdl.handle.net/11104/0277552
Počet záznamů: 1