2011

Quantised supercurrent decay in an annular Bose-Einstein condensate

Moulder, Stuart, Beattie, Scott, Smith, Robert P. et al.

Understand

We study the metastability and decay of multiply-charged superflow in a ring-shaped atomic Bose-Einstein condensate.

Supercurrent corresponding to a giant vortex with topological charge up to q=10 is phase-imprinted optically and detected both interferometrically and kinematically.
We observe q=3 superflow persisting for up to a minute and clearly resolve a cascade of quantised steps in its decay.
These stochastic decay events, associated with vortex-induced $2 \pi$ phase slips, correspond to collective jumps of atoms between discrete q values.

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