Evidence for a Critical Velocity in a Bose-Einstein Condensed Gas

C. Raman, M. Köhl, R. Onofrio, D. S. Durfee, C. E. Kuklewicz, Z. Hadzibabic, W. Ketterle
1999 Physical Review Letters  
We have studied dissipation in a Bose--Einstein condensed gas by moving a blue detuned laser beam through the condensate at different velocities. Strong heating was observed only above a critical velocity.
doi:10.1103/physrevlett.83.2502 fatcat:ajwscnh4trel5c2mciq7an5swa