Self-trapping of bosons and fermions in optical lattices

DS Luhmann, Kai Bongs, K Sengstock, D Pfannkuche

Research output: Contribution to journalArticle

64 Citations (Scopus)


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 Rb-87-K-40 mixtures, where a large shift of the critical point has been found.
Original languageEnglish
Article number050402
JournalPhysical Review Letters
Issue number5
Publication statusPublished - 1 Jan 2008


Dive into the research topics of 'Self-trapping of bosons and fermions in optical lattices'. Together they form a unique fingerprint.

Cite this