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Cold atoms in rotating optical lattice

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Atoms interacting with standing waves of laser light experience a periodic potential (optical lattice), and there is only a small rate of spontaneous scattering (leading to heating) if the laser operates far from the atomic resonance frequency. Loading cold (rubidium) atoms from a Bose-Einstein condensate into such an optical lattice gives a strongly-correlated quantum system that is highly controllable. In our experiment the optical lattice is rotated so that the atoms experience an artificial magnetic field, i.e. the Hamiltonian of the atoms in the rotating frame resembles that of a charged particle in a strong magnetic field. In the future, we plan to use this for Direct Quantum Simulation of the Quantum Hall Effect.

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