Hannover 2010 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 24: Quantum Gases: Mixtures and Spinor Gases

Q 24.4: Vortrag

Mittwoch, 10. März 2010, 11:15–11:30, E 001

Phase diagram of Bose-Fermi mixtures in the light fermion limit — •Alexander Mering and Michael Fleischhauer — Fachbereich Physik and research center OPTIMAS, Technische Universität Kaiserslautern

We present analytic results for the phase diagram of Bose-Fermi mixtures in the limit of ultralight fermions. Starting from a discussion of the dependence of the Mott insulating phases on the density of fermions we show how the bosonic phase diagram can be understood in terms of a purely bosonic system with underlying complex potential induced by the fermions. Treating the special case of half fermionic filling we show the emergence of a charge density wave phase with a strong interplay between bosons and fermions. In terms of an effective theory we derive the full phase diagram in this case, giving analytic results for all incompressible phases including the CDW phase. Furthermore the existence of regions of coexistence between Mott insulators and CDW is predicted. All analytic results are supported by numerical results obtained by DMRG, showing a good agreement to the analytic predictions.