Regensburg 2016 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 78: Correlated Electrons: Poster Session
TT 78.39: Poster
Donnerstag, 10. März 2016, 15:00–18:30, Poster D
Frustration and Interaction in complex 2-dimensional Systems — •Malte Harland1, Mikhail Katsnelson2, and Alexander Lichtenstein1 — 1University of Hamburg — 2Radboud University Nijmegen
We present a study of magnetic frustration in the Hubbard model. Frustration effects are a highly debated topic, since they are assumed to reveal new phases, e.g. spin liquids. To control the degree of frustration we interpolate the nearest-neighbour -- next-nearest-neighbour hopping ratio of the square lattice. We choose a special 2d-lattice such, that the next-nearest-neighbour hopping exists only in every second square and is checkerboard-like distributed. We solve the half-filled Hubbard model and characterize different phases by means of the Cluster Dynamical Mean-Field Theory(CDMFT) for small, intermediate and large local Hubbard interactions. CDMFT maps the lattice problem onto a cluster in the Anderson-impurity model, that is solved numerically by a continuous-time quantum Monte Carlo solver (CTHYB). CDMFT enables us to investigate the non-local, short-range correlations of this frustrated system.