2003/03/27 by K. Ziegler
Physics and Astronomy · #cond-mat.stat-mech
published as Laser Physics 13, 587-593 (2003) · 12 pages, 4 figures, talk given at LPHYS '02
arxiv created 2003/03/27 · arxiv updated 2009/11/30
A grand-canonical system of interacting bosons is considered to study phase transitions of ultracold atoms in an optical lattice. The phase diagram is discussed in terms of a matrix-like order parameter, representing a symmetric phase (Mott insulator) and a symmetry-broken phase (Bose-Einstein condensate). An exact solution was found by introducing N colors and taking the limit N→∞.