Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 57: Poster 3: Quantengase, Ultrakalte Atome, Ultrakalte Moleküle, Materiewellen Optik, Präzisionsmessungen, Metrologie
Q 57.16: Poster
Donnerstag, 17. März 2011, 16:30–19:30, P1
(contribution withdrawn) Interactions and crossovers between insulating phases of fermionic gases in optical lattices — •Victor Hugo Ferreira Bezerra1, Flavio de Souza Nogueira1, and Axel Pelster2 — 1Institut für Theoretische Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — 2Fachbereich Physik, Universität Duisburg-Essen, Lotharstrasse 1, 47048 Duisburg, Germany
Recent experimental progress in the field of cold atoms has boosted a world-wide quest to simulate condensed matter problems within the realm of ultracold quantum gases in optical lattices. A considerable progress was achieved last years with the realization of a fermionic Mott insulator in an optical lattice. Several groups are now focusing experimental and theoretical efforts to realize the BEC-BCS crossover and different magnetic phases in optical lattices. In this work we investigate the phase structure for interacting fermions near a Feshbach resonance in two- and three-dimensional cubic lattices. To this end we have analyzed the underlying Hubbard-like model with a recently developed field-theoretic many-body technique to describe crossovers and transitions between the diferent phases related to superconducting and antiferromagnetic instabilities. In particular, we have calculated the quantum effective action and obtained in the strongly correlated regime a crossover between magnetic and charge ordered insulators. This crossover corresponds to the strongly correlated counterpart of the BCS-BEC crossover, which for our lattice model occurs in the weakly coupled regime.