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Effective non-linear spinor dynamics in a spin-1 Bose-Einstein condensate

TitleEffective non-linear spinor dynamics in a spin-1 Bose-Einstein condensate
Publication TypePreprint
AuthorsMichelangeli, A, Olgiati, A
Document NumberSISSA;12/2018/MATE

We derive from first principles the experimentally observed effective
dynamics of a spinor Bose gas initially prepared as a Bose-Einstein condensate
and then left free to expand ballistically. In spinor condensates, which
represent one of the recent frontiers in the manipulation of ultra-cold atoms,
particles interact with a two-body spatial interaction and a spin-spin interaction.
The effective dynamics is governed by a system of coupled semi-linear
Schrödinger equations: we recover this system, in the sense of marginals in
the limit of infinitely many particles, with a mean-field re-scaling of the manybody
Hamiltonian. When the resulting control of the dynamical persistence
of condensation is quantified with the parameters of modern observations, we
obtain a bound that remains quite accurate for the whole typical duration of
the experiment.

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