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- W2008146769 abstract "We investigate the superfluid properties of a dipolar Bose-Einstein condensate (BEC) in a fully three-dimensional trap. Specifically, we calculate a superfluid critical velocity for this system by applying the Landau criterion to its discrete quasiparticle spectrum. We test this critical velocity by direct numerical simulation of condensate depletion as a blue-detuned laser moves through the condensate. In both cases, the presence of the roton in the spectrum serves to lower the critical velocity beyond a critical particle number. Since the shape of the dispersion, and hence the roton minimum, is tunable as a function of particle number, we thereby propose an experiment that can simultaneously measure the Landau critical velocity of a dipolar BEC and demonstrate the presence of the roton in this system." @default.
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- W2008146769 date "2010-03-01" @default.
- W2008146769 modified "2023-09-26" @default.
- W2008146769 title "Critical Superfluid Velocity in a Trapped Dipolar Gas" @default.
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- W2008146769 doi "https://doi.org/10.1103/physrevlett.104.094501" @default.
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