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Q: Fachverband Quantenoptik und Photonik

Q 27: Poster Quantengase

Q 27.15: Poster

Dienstag, 11. März 2008, 16:30–19:00, Poster C2

Ultracold Atomic Gases in 1D Optical Lattices: Qualitative behaviour of the DMRG method in inhomogenous topologies — •Felix Schmitt, Markus Hild, Sven Binder, and Robert Roth — Institut fuer Kernphysik, Technische Universitaet Darmstadt

The Density Matrix Renormalisation Group (DMRG) has become the state of the art method to treat ultracold atomic gases in optical lattices. While the infinite-size algorithm is usually sufficient to describe cold atoms in homogenous lattices with high precision even with moderate numbers of many-particle states, it becomes unreliable once inhomogenities occur. In most cases this can be cured by the finite-size DMRG algorithm. We focus on the problem of the Bose-Glass transition in order to study the behaviour of DMRG when unequal degrees of freedom are appended. This may shed light on the behaviour of DMRG applied to other quantum mechanical many-body problems, e.g. for nuclei or nuclear matter.