Localisation of Bose-Einstein condensates in optical lattices

Jin-Cui Zhao, Ping Yuan

O. Morsch

Russell Campbell, Mateusz Borkowski, Gian‐Luca Oppo

The properties of Bose-Einstein condensates (BEC) can be studied and controlled effectively when trapped in optical lattices. In the limit of tight binding, BEC in optical lattices are well described by the discrete nonlinear Schrödinger equation (DNLSE). Spatially localised modes of excitations, known as discrete breathers or lattice solitons, can occur in the DNLSE. These have been shown to evolve from initial conditions of Gaussian wave-packets. Using this method with the addition of an initial momentum, mobile breathers that travel across the lattice with a constant velocity can also be formed.

俊二 土屋

Antoine Browaeys, J. V. Porto, S P. Peil +3 more

Gian‐Luca Oppo, Roberto Franzosi, Roberto Livi

A technique, based on boundary dissipation, capable to localise and probe the breather dynamics of Bose-Einstein condensates (BEC) in optical lattices is described. Numerical simulations of BEC in optical lattices with atomic losses at the trap ends are presented and the dynamical evolution of the atomic density starting from a uniform filling the lattice. The utilization of atomic losses at the boundaries to probe the dynamics of the localized structures inside the lattice is investigated.