Shaken to order: Dressed matter waves in driven periodic potentials

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• Dr Oliver Morsch (University of Pisa)
• Monday 16 February 2009, 15:30-17:00
• HEP Seminar Room (980) Rutherford Building, Cavendish Laboratory.

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Strong driving of a periodic potential can lead to a reduction or even supression of tunneling between the lattices wells. In our experiments with Bose-Einstein condensates in strongly driven (“shaken”) optical lattices we have demonstrated this tunneling suppression and found that the coherence of the wavefunction can be preserved if the parameters of the driving are chosen appropriately. This allowed us to load the condensate adiabatically into a single Floquet state of the driven system and to explore the properties of the resulting “dressed matter waves”. In particular, in a three-dimensional lattice we have seen strong evidence that the superfluid to Mott insulator quantum phase transiition can be induced through the strong driving.

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