Dresden 2020 – wissenschaftliches Programm

Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

DY: Fachverband Dynamik und Statistische Physik

DY 55: Poster: Turbulence; Complex Fluids; Microfluidics; Droplets and Wetting

DY 55.17: Poster

Donnerstag, 19. März 2020, 15:00–18:00, P1A

Nonlocal interactions in strongly correlated systems — •Daria Medvedeva — Institute of Physics of the Czech Academy of Sciences, Prague 8, Czech Republic — Ural Federal University, Yekaterinburg, Russian Federation

Systems with strong electron correlations can be perfectly described by quantum lattice models, e.g. by the Hubbard model. If coordination number or spatial dimension tend to infinity, this model can be solved by the Dynamical Mean-Field Theory taking into account only local correlations. However according to recent studies [1] we can’t neglect nonlocal (between lattice sites) interactions in some materials. Moreover it was found that there are strong electron correlations in the systems with sp- electrons [2]. Theoretical description of such systems can be obtained making use the Extended Dynamical Mean-Field Theory (EDMFT). This research was devoted to development of a numerical algorithm to solve EDMFT equations. We have developed the numerical complex based on the exact diagonalization approach. The minimal parameterization of the effective impurity model was determined for different types of interactions. Using this scheme, we considered charge and exchange nonlocal interactions influence on the electronic properties of the model system and screening of the local Coulomb interaction by nonlocal one. We described functionalized graphene structures with adsorbed F and H atom, which can be really synthesized. [1] PRB 94, 214411 (2016). PRB 94, 224418 (2016). PRL 111, 036601 (2013). PRB 74, 212507 (2006). [2] PRL 110, 166401 (2013). PRB 88, 081405(R) (2013).