title: Observation of photon-assisted tunneling in optical lattices.
abstract: We have observed tunneling suppression and photon-assisted tunneling of Bose-Einstein condensates in an optical lattice subjected to a constant force plus a sinusoidal shaking. For a sufficiently large constant force, the ground energy levels of the lattice are shifted out of resonance and tunneling is suppressed; when the shaking is switched on, the levels are coupled by low-frequency photons and tunneling resumes. Our results agree well with theoretical predictions and demonstrate the usefulness of optical lattices for studying solid-state phenomena.
authors: CNR-INFM, Dipartimento di Fisica E. Fermi, Università di Pisa, Largo Pontecorvo 3, 56127 Pisa, Italy.
authors: C
authors: C
authors: Sias
authors: H
authors: H
authors: Lignier
authors: Y P
authors: YP
authors: Singh
authors: A
authors: A
authors: Zenesini
authors: D
authors: D
authors: Ciampini
authors: O
authors: O
authors: Morsch
authors: E
authors: E
authors: Arimondo