Self-Trapping of Bosons and Fermions in Optical Lattices

Details Self-Trapping of Bosons and Fermions in Optical Lattices Self-Trapping of Bosons and Fermions in Optical Lattices

2007-11-19

arxiv.org/abs/0711.2975v2

Phys. Rev. Lett. 101, 050402 (2008)

Physics

Condensed Matter

Other Condensed Matter

4 pages, 4 figures. Published version

Scientific paper

10.1103/PhysRevLett.101.050402

We theoretically investigate the enhanced localization of bosonic atoms by fermionic atoms in three-dimensional optical lattices and find a self-trapping of the bosons for attractive boson-fermion interaction. Because of this mutual interaction, the fermion orbitals are substantially squeezed, which results in a strong deformation of the effective potential for bosons. This effect is enhanced by an increasing bosonic filling factor leading to a large shift of the transition between the superfluid and the Mott-insulator phase. We find a nonlinear dependency of the critical potential depth on the boson-fermion interaction strength. The results, in general, demonstrate the important role of higher Bloch bands for the physics of attractively interacting quantum gas mixtures in optical lattices and are of direct relevance to recent experiments with 87Rb - 40K mixtures, where a large shift of the critical point has been found.

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