Ultracold atoms in one-dimensional optical lattices approaching the Tonks-Girardeau regime |
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Authors: | Pollet L Rombouts S M A Denteneer P J H |
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Affiliation: | Vakgroep Subatomaire en Stralingsfysica, Universiteit Gent, Proeftuinstraat 86, 9000 Gent, Belgium. |
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Abstract: | Recent experiments on ultracold atomic alkali gases in a one-dimensional optical lattice have demonstrated the transition from a gas of soft-core bosons to a Tonks-Girardeau gas in the hard-core limit, where one-dimensional bosons behave like fermions in many respects. We have studied the underlying many-body physics through numerical simulations which accommodate both the soft-core and hard-core limits in one single framework. We find that the Tonks-Girardeau gas is reached only at the strongest optical lattice potentials. Results for slightly higher densities, where the gas develops a Mott-like phase already at weaker optical lattice potentials, show that these Mott-like short-range correlations do not enhance the convergence to the hard-core limit. |
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