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- W2075005957 abstract "We present a study of the superfluid properties of atomic Bose gases in optical lattice potentials using the Bose-Hubbard model. To do this, we use a microscopic definition of the superfluid fraction based on the response of the system to a phase variation imposed by means of twisted boundary conditions. We compare the superfluid fraction to other physical quantities, i.e., the interference pattern after ballistic expansion, the quasi-momentum distribution, and number fluctuations. We have performed exact numerical calculations of all these quantities for small one-dimensional systems. We show that the superfluid fraction alone exhibits a clear signature of the Mott-insulator transition. Observables like the fringe visibility, which probe only ground state properties, do not provide direct information on superfluidity and the Mott-insulator transition." @default.
- W2075005957 created "2016-06-24" @default.
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- W2075005957 date "2003-03-25" @default.
- W2075005957 modified "2023-09-28" @default.
- W2075005957 title "Superfluidity and interference pattern of ultracold bosons in optical lattices" @default.
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- W2075005957 doi "https://doi.org/10.1103/physreva.67.031602" @default.
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