Topology Induced Spatial Bose-Einstein Condensation for Bosons on Star-Shaped Optical Networks
arXiv:cond-mat/0404500 · doi:10.1088/0953-4075/37/7/072
Abstract
New coherent states may be induced by pertinently engineering the topology of a network. As an example, we consider the properties of non-interacting bosons on a star network, which may be realized with a dilute atomic gas in a star-shaped deep optical lattice. The ground state is localized around the star center and it is macroscopically occupied below the Bose-Einstein condensation temperature T_c. We show that T_c depends only on the number of the star arms and on the Josephson energy of the bosonic Josephson junctions and that the non-condensate fraction is simply given by the reduced temperature T/T_c.
20 Pages, 5 Figures
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