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- W2898838589 abstract "In this paper we examine the excitations observable in atoms confined in an optical lattice around the superfluid-insulator transition. We use increases in the number variance of atoms, subsequent to tilting the lattice as the primary diagnostic of excitations in the lattice. We show that this locally determined quantity should be a robust indicator of coherence changes in the atoms observed in recent experiments. This was found to hold for commensurate or non-commensurate fillings of the lattice, implying our results will hold for a wide range of physical cases. Our results are in good agreement with the quantitative factors of recent experiments. We do, howevers, find extra features in the excitation spectra. The variation of the spectra with the duration of the perturbation also turns out to be an interesting diagnostic of atom dynamics." @default.
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- W2898838589 date "2002-11-29" @default.
- W2898838589 modified "2023-09-24" @default.
- W2898838589 title "Excitations of Bose condensates in optical lattices" @default.
- W2898838589 hasPublicationYear "2002" @default.
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