Simplified step-potential model shows critical velocity of BEC superflow minimized to zero at local condensation transition with v_c scaling as L_x to the power -0.963.
Rica, A remark on the critical speed for vortex nucle- ation in the nonlinear Schr¨ odinger equation, Physica D: Nonlinear Phenomena148, 221 (2001)
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Anomalous minimization for critical velocity of superflow along a step potential
Simplified step-potential model shows critical velocity of BEC superflow minimized to zero at local condensation transition with v_c scaling as L_x to the power -0.963.