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Ordered structures in rotating ultracold Bose gases
Barberán Falcón, Núria; Lewenstein, M.; Osterloh, Klaus; Dagnino, D.
Universitat de Barcelona
Two-dimentional systems of trapped samples of few cold bosonic atoms submitted to strong rotation around the perpendicular axis may be realized in optical lattices and microtraps. We investigate theoretically the evolution of ground state structures of such systems as the rotational frequency Omega increases. Various kinds of ordered structures are observed. In some cases, hidden interference patterns exhibit themselves only in the pair correlation function; in some other cases explicit broken-symmetry structures appear that modulate the density. For N < 10 atoms, the standard scenario, valid for large sytems is absent, and is only gradually recovered as N increases. On the one hand, the Laughlin state in the strong rotational regime contains ordered structures much more similar to a Wigner molecule than to a fermionic quantum liquid. On the other hand, in the weak rotational regime, the possibility to obtain equilibrium states, whose density reveals an array of vortices, is restricted to the vicinity of some critical values of the rotational frequency Omega.
Bose-Einstein condensation
Efecte Hall
Efecte Hall quàntic
Condensació de Bose-Einstein
Quantum Hall effect
Tunneling (Physics)
(c) The American Physical Society, 2006
The American Physical Society

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