Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2007-11-19
Phys. Rev. Lett. 100, 130401 (2008)
Physics
Condensed Matter
Other Condensed Matter
11 pages, 3 figures
Scientific paper
10.1103/PhysRevLett.100.040402
Dynamics of attractive ultra-cold bosonic clouds in one dimension are studied by solving the many-particle time-dependent Schr\"odinger equation. The initially coherent wave-packet can dynamically dissociate into two parts when its energy exceeds a threshold value. Noticeably, the time-dependent Gross-Pitaevskii theory applied to the same initial state does not show up the splitting. We call the split object {\it fragmenton}. It possesses remarkable properties: (1) it is two-fold fragmented, i.e., not coherent; (2) it is dynamically stable, i.e., it propagates almost without dispersion; (3) it is delocalized, i.e., the two dissociated parts still communicate with one another. A simple static model predicts the existence of fragmented states which are responsible for formation and dynamics of fragmentons.
Alon Ofir E.
Cederbaum Lorenz S.
Streltsov Alexej I.
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