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Dissipation and Vortex Creation in Bose-Einstein Condensed Gases

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arxiv cond-mat/9912365 v2 pith:6RNNY2KJ submitted 1999-12-20 cond-mat.stat-mech

Dissipation and Vortex Creation in Bose-Einstein Condensed Gases

classification cond-mat.stat-mech
keywords energybose-einsteincriticalobjecttransfervortexaboveagreement
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We solve the Gross-Pitaevskii equation to study energy transfer from an oscillating `object' to a trapped Bose-Einstein condensate. Two regimes are found: for object velocities below a critical value, energy is transferred by excitation of phonons at the motion extrema; while above the critical velocity, energy transfer is via vortex formation. The second regime corresponds to significantly enhanced heating, in agreement with a recent experiment.

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