Hannover 2010 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 23: Poster II

A 23.32: Poster

Donnerstag, 11. März 2010, 16:30–19:00, Lichthof

Real-space Dynamical Mean-Field Theory For an Inhomogeneous Bose-Bose Mixture — •Yongqiang Li, Mohammad Reza Bakhtiari, and Walter Hofstetter — Institut für Theoretische Physik , Frankfurt am Main, Germany

Motivated by recent experiments on Bose-Bose mixtures (e.g [1]), we theoretically investigate a two-component Bose-Hubbard model. We consider such a mixture both in two and three dimensional cubic optical lattices, in the presence of an external confining potential. In order to study this inhomogeneous many-body system, we develop a real-space Bosonic Dynamical Mean-Field Theory (R-BDMFT) [2] which is capable of accurately describing the model over a wide range of parameters. For various total filling of both species, we obtain spin-resolved density distributions and more importantly different spin orders including Mott insulator, XY-ferromagnet and XY-superfluid. When each species is at filling one, we determine the phase diagram which shows a second order phase transition from XY-ferromagnet to a Mott insulator and a first order phase transition from XY-ferromagnet to a one-component superfluid state.

[1] J. Catani et al., Phys. Rev. A 77,011603(R) (2008) [2] A. Hubener. M. Snoek and W. Hofstetter, arXiv:0902.2212