Volume 80, Number 5, December 2007
|Number of page(s)||6|
|Published online||29 October 2007|
Institut für Physik, Carl von Ossietzky Universität - D-26111 Oldenburg, Germany
Corresponding author: email@example.com
Accepted: 4 October 2007
We argue that a system of ultracold bosonic atoms in a tilted optical lattice can become superfluid in response to resonant AC forcing. Among others, this allows one to prepare a Bose-Einstein condensate in a state associated with a negative effective mass. Our reasoning is backed by both exact numerical simulations for systems consisting of few particles, and by a theoretical approach based on Floquet-Fock states.
PACS: 03.75.Lm – Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations / 03.75.Kk – Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow
© Europhysics Letters Association, 2007
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