Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 34: Postersession Matter at Low Temperature: Quantum Liquids, Bose-Einstein Condensates, Ultra-Cold Atoms

TT 34.2: Poster

Mittwoch, 25. März 2009, 14:00–18:00, P1A

Quantum Monte Carlo Simulation of Suprafluidity with Fermions in a Two Dimensional Optical Lattice — •Klaus Ferdinand Albrecht and Alejandro Muramatsu — Institut für Theoretische Physik III, Universität Stuttgart, D-70550 Stuttgart, Germany

Based on a Projector Quantum Monte Carlo Simulation, we examine the ground state properties of the attractive 2D fermionic Hubbard model. The main focus is on the supersolid phase, where in a periodic system it is known that the superfluid phase coexists with a crystalline structure (CDW-phase) at density n=1. We obtain the conditions for such a phase when the system is confined in a harmonic trap. Furthermore, we consider the BCS-BEC crossover region in a periodic system.