Quantised superflow glitches in an annular Bose-Einstein condensate

Details Quantised superflow glitches in an annular Bose-Einstein condensate Quantised superflow glitches in an annular Bose-Einstein condensate

2011-12-01

arxiv.org/abs/1112.0334v2

Physics

Condensed Matter

Quantum Gases

4.1 pages, 4 figures

Scientific paper

We study 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 the eventual decay of the supercurrent. These stochastic glitches in the superflow, associated with vortex-induced phase slips, correspond to collective jumps of atoms between discrete q values. We also quantitatively study time-resolved dynamics of phase slips.

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