Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2006-03-08
Phys.Rev. A73, 063623 (2006)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
35 pages, 17 figures
Scientific paper
10.1103/PhysRevA.73.063623
The characterization of small samples of cold bosonic atoms in rotating microtraps has recently attracted increasing interest due to the possibility to deal with a few number of particles per site in optical lattices. We analyze the evolution of ground state structures as the rotational frequency $\Omega$ increases. Various kinds of ordered structures are observed. For $N<10$ atoms, the standard scenario, valid for large sytems, is absent, and only gradually recovered as $N$ increases. The vortex contribution to the total angular momentum $L$ as a function of $\Omega$ ceases to be an increasing function of $\Omega$, as observed in experiments of Chevy {\it et al.} (Phys. Rev. Lett. 85, 2223 (2000)). Instead, for small $N$, it exhibits a sequence of peaks showing wide minima at the values of $\Omega$, where no vortices appear.
Barberan Nuria
Dagnino D.
Lewenstein Maciej
Osterloh Klaus
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