We improve on the Popov theory for partially Bose-Einstein condensed atomic gases by treating the phase fluctuations exactly. As a result, the theory becomes valid in arbitrary dimensions and is able to describe the low-temperature crossover between three-, two-, and one-dimensional Bose gases, which is currently being explored experimentally. We consider both homogeneous and trapped Bose gases.
Bose-Einstein condensation (BEC) in cold gases can be turned on and off by an\nexternal potential, such as that presented by an optical lattice. We present a\nmodel of this phen...
This article reviews recent experimental and theoretical progress on many-body phenomena in dilute, ultracold gases. Its focus are effects beyond standard weak-coupling descript...
We consider a homogeneous 1D Bose gas with contact interactions and a large attractive coupling constant. This system can be realized in tight waveguides by exploiting a confine...
By using the diffusion Monte Carlo method we calculate the one- and two-body density matrix of an interacting Fermi gas at T = 0 in the BCS to Bose-Einstein condensate (BEC) cro...
We propose to utilize density-density correlations in the image of an\nexpanding gas cloud to probe complex many body states of trapped ultra-cold\natoms. In particular we show ...
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