Correlated hopping of bosonic atoms induced by optical lattices

Details Correlated hopping of bosonic atoms induced by optical lattices Correlated hopping of bosonic atoms induced by optical lattices

2009-08-17

arxiv.org/abs/0908.2383v1

New J. Phys. 11 093028 (2009)

Physics

Condensed Matter

Other Condensed Matter

24 pages with 9 figures, to appear in New Journal of Physics

Scientific paper

10.1088/1367-2630/11/9/093028

In this work we analyze a particular setup with ultracold atoms trapped in state-dependent lattices. We show that any asymmetry in the contact interaction translates into one of two classes of correlated hopping. After deriving the effective lattice Hamiltonian for the atoms, we obtain analytically and numerically the different phases and quantum phase transitions. We find for weak correlated hopping both Mott insulators and charge density waves, while for stronger correlated hopping the system transitions into a pair superfluid. We demonstrate that this phase exists for a wide range of interaction asymmetries and has interesting correlation properties that differentiate it from an ordinary atomic Bose-Einstein condensate.

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