Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 2: Quantum Gases: Bosons 1
Q 2.2: Vortrag
Montag, 14. März 2011, 10:45–11:00, HÜL 386
From Rotating Atomic Rings to Quantum Hall States — Marco Roncaglia1, •Matteo Rizzi2, and Jean Dalibard3 — 1Dipartimento di Fisica del Politecnico, corso Duca degli Abruzzi 24, I-10129, Torino, Italy — 2Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, D-85748, Garching, Germany — 3Laboratoire Kastler Brossel, CNRS, UPMC, École normale supe*rieure, 24 rue Lhomond, 75005 Paris, France
Considerable efforts are currently devoted to prepare ultracold neutral atoms in the emblematic strongly correlated quantum Hall regime. The routes followed so far essentially rely on thermodynamics, i.e. imposing the proper Hamiltonian and cooling the system towards its ground state. In rapidly rotating 2D harmonic traps the role of transverse magnetic field is played by the angular velocity. The required huge angular momentum can be obtained only for spinning frequencies extremely near to deconfinement limit; consequently, the prescribed control turns out to be far too stringent.
Here we propose to follow instead a dynamic path starting from the gas confined in a rotating ring by a repulsive "plug" laser. The large moment of inertia of the fluid facilitates the access to states with a large angular momentum, corresponding to a giant vortex. The "plug" is then adiabatically removed, leaving only an harmonic confinement on. We provide clear numerical evidence that for a relatively broad range of initial angular frequencies, the giant vortex state is adiabatically connected to the bosonic ν=1/2 Laughlin state. We discuss the scaling to many particles and the robustness against trap defects.