M C Witthoeft and M S Pindzola 2006 Phys. Scr. 73 274 doi:10.1088/0031-8949/73/3/006
M C Witthoeft1 and M S Pindzola2
Show affiliationsThe flow of a Bose–Einstein condensate through smooth and corrugated waveguides is studied by direct numerical solution of the time-dependent Gross–Pitaevskii equation. One end of each waveguide has a teacup longitudinal potential, which when lowered generates a quasi-continuous supersonic flow. As the nonlinear strength factor, which is proportional to the scattering length times the number of atoms, becomes more positive, we find that the condensate broadens and moves more rapidly down a smooth waveguide. For a given nonlinear strength factor, an increase in the size of corrugations in the waveguide, used to simulate imperfections in experimental structures, has a noticeable effect on condensate flow. However, for a given corrugation size, an increase in the condensate flow is always observed when the nonlinear strength factor is increased.
03.75.Kk Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow
Issue 3 (March 2006)
Received 19 September 2005, accepted for publication 27 October 2005
Published 6 February 2006
M C Witthoeft and M S Pindzola 2006 Phys. Scr. 73 274
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