Creffield, Charles2023-06-202023-06-202009-061050-294710.1103/PhysRevA.79.063612https://hdl.handle.net/20.500.14352/44738©2009 The American Physical Society. The author was supported by the Ramón y Cajal program of the Spanish MCINN.We investigate the dynamics of a Bose-Einstein condensate held in an optical lattice under the influence of a strong periodic driving potential. Studying the mean-field version of the Bose- Hubbard model reveals that the condensate becomes dynamically unstable when the effective intersite tunneling becomes negative. We further show how controlling the sign of the tunneling can be used to manage the dispersion of an atomic wave packet.engjournal articlehttp://dx.doi.org/10.1103/PhysRevA.79.063612http://journals.aps.orgopen access538.9Optical latticeFísica de materialesFísica del estado sólido2211 Física del Estado Sólido