Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2006-09-14
Phys. Rev. A 74, 063614 (2006)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
6 pages, 5 figures
Scientific paper
10.1103/PhysRevA.74.063614
We investigate the nonlinear self-trapping phenomenon of the Bose-Einstein condensates (BEC) in a symmetric double-well, emphasizing on its behind dynamical phase transition. With increasing the nonlinear parameter depicting the interaction between the degenerate atoms the BEC turns to be self-trapped manifesting an asymmetric distribution of the atomic density profile. Essence of this phenomenon is revealed to be a continuous phase transition and underlying critical behavior is studied analytically and found to follow a logarithm scaling-law. We then go beyond the mean field treatment and extend to discuss the effect of the many-body quantum fluctuation on the transition. It is found that the transition point is shifted and the scaling-law is broken. In particular, the quantum phase transition is accompanied by the change of the entanglement entropy which is found to reach maximum at transition point. Behind physics is revealed.
Fu Li-Bin
Liu Jie
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