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Paper detail

Superfluid Density of Weakly Interacting Bosons on a Lattice

We use a path integral approach to calculate the superfluid density of a Bose lattice gas in the limit where the number of atoms per site is large. Our analytical expressions agree with numerical results on small systems for low temperatures and relatively weak interactions. We also calculate the superfluid density and drag for two-component lattice bosons. To attain the correct results we develop tools for calculating discrete time path integrals. These tools should be broadly applicable to a range of systems which are naturally described within an overcomplete basis.

preprint2012arXivOpen access
Yariv YanayErich J Mueller
cond-mat.quant-gas
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Yariv YanayErich J Mueller

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