Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-06-03
Phys.Rev.Lett.102:070401,2009
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages, 3 eps figures, revised and improved version
Scientific paper
10.1103/PhysRevLett.102.070401
We study both mean-field and full quantum dynamics of symmetry-breaking transitions (SBTs) in a coupled two-component Bose-Einstein condensate. By controlling s-wave scattering lengths and coupling strength, it is possible to stimulate SBTs between normal and spontaneously polarized ground states. In static transitions, the probability maxima of full quantum ground states correspond to the mean-field ground states. In dynamical transitions, due to the vanishing of excitation gaps, the mean-field dynamics shows universal scalings obeying Kibble-Zurek mechanism. Both mean-field and full quantum defect modes appear as damped oscillations, but they appear at different critical points and undergo different oscillation regimes. The anomalous breakdown of mean-field dynamics induced by SBTs depends on the approaching direction.
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