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Expansion of matter waves in static and driven periodic potentials Creffield, Charles Sols Lucía, Fernando Ciampini, D. Morsch, O. Arimondo, E. 538.9 Localization Física de materiales Física del estado sólido 2211 Física del Estado Sólido ©2010 The American Physical Society. This research was supported by the Acción Integrada/ Azioni Integrate scheme (Spain/Italy). The authors also acknowledge support from the Spanish MICINN through Grant No. FIS-2007-65723 and the Ramón y Cajal program (CEC).We thank H. Lignier, C. Sias,Y. Singh, and A. Zenesini for assistance with the experiments. We study the nonequilibrium dynamics of cold atoms held in an optical lattice subjected to a periodic driving potential. The expansion of an initially confined atom cloud occurs in two phases: an initial quadratic expansion followed by a ballistic behavior at long times. Accounting for this gives a good description of recent experimental results and provides a robust method to extract the effective intersite tunneling from time-of-flight measurements. Accion Integrada/Azioni Integrate scheme (Spain/Italy) MICINN, Spain Ramon y Cajal program (CEC) Depto. de Física de Materiales Fac. de Ciencias Físicas TRUE pub 2023-06-19T14:56:01Z 2023-06-19T14:56:01Z 2014-01-27 journal article https://hdl.handle.net/20.500.14352/34845 1050-2947 10.1103/PhysRevA.82.035601 eng FIS-2007-65723 open access application/pdf American Physical Society