Emergence of superfluid transport in a dynamical system of ultra-cold atoms
نویسندگان
چکیده
The dynamics of a Bose-Einstein condensate is studied theoretically in a combined periodic plus harmonic external potential. Different dynamical regimes of stable and unstable collective dipole and Bloch oscillations are analysed in terms of a quantum mechanical pendulum model. Nonlinear interactions are shown to counteract quantum-mechanical dephasing and lead to phase-coherent, superfluid transport. PACS. 03.75.Lm Tunnelling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices and topological excitations – 05.45.-a Nonlinear dynamics and chaos
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