Fragmentation and destruction of the superfluid due to frustration of cold atoms in optical lattices
Juan José García‐Ripoll, Jiannis K. Pachos
A one-dimensional optical lattice is considered where a second dimension is encoded in the internal states of the atoms giving effective ladder systems. Frustration is introduced by an additional optical lattice that induces tunnelling of superposed atomic states. The effects of frustration range from the stabilization of the Mott insulator phase with ferromagnetic order, to the breakdown of superfluidity and the formation of a macroscopically fragmented phase.
arXiv:cond-mat/0604164•New Journal of Physics•May 21, 2007•10 citations