Bound states in quantum emitter arrays can induce coherent transport though polariton formation. Here, we investigate effects of bound-state induced hopping on motional coherence in an array of matter-wave emitters realized with ultracold atoms in an optical lattice.

Frontiers in OpticsJan 1, 20200 citations

Matter-Wave Gap Vortices in Optical Lattices

Elena A. Ostrovskaya, Yuri S. Kivshar

We predict the existence of spatially localized nontrivial topological states of a Bose-Einstein condensate with repulsive atomic interactions confined by an optical lattice. These nonlinear localized states, matter-wave gap vortices, carry a vortexlike phase dislocation and exist in the gaps of the matter-wave band-gap spectrum due to the Bragg scattering. We discuss the structure, stability, and formation dynamics of the gap vortices in the case of two-dimensional optical lattices.

arXiv:cond-mat/0404714Physical Review LettersOct 13, 2004107 citations