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Q: Fachverband Quantenoptik und Photonik

Q 7: Quantengase: Bosonen im Gitter I

Q 7.3: Talk

Monday, March 2, 2009, 14:30–14:45, VMP 6 HS-A

Bosons in 1D Optical Superlattices: Computing the Phase Diagram from Experimental Parameters — •Felix Schmitt, Markus Hild, and Robert Roth — Institut fuer Kernphysik, Technische Universitaet Darmstadt

We determine the exact zero-temperature phase-diagram of bosonic atoms in a one-dimensional optical superlattice for different experimental setups [T. Stoeferle et al., Phys. Rev. Lett. 92 130403 (2004); J. E. Lye et al., Phys. Rev. A 75 061603 (2007)] directly using the experimental superlattice amplitudes as control parameters. To this end the site-dependent Hubbard parameters, i.e. hopping, two-particle interaction, and on-site energy, are extracted via a single-particle bandstructure calculation from the amplitudes of the standing waves forming the two-color superlattice potential. The many-particle problem is then solved with the finite-size density matrix renormalization group (DMRG) technique. This procedure offers the possibility to study observables like the visibility of the interference fringes directly as function of the experimental parameters.