title: Long-lasting exponential spreading in periodically driven quantum systems.
abstract: Using a dynamical model relevant to cold-atom experiments, we show that long-lasting exponential spreading of wave packets in momentum space is possible. Numerical results are explained via a pseudoclassical map, both qualitatively and quantitatively. Possible applications of our findings are also briefly discussed.
authors.affiliation: Department of Physics and Institute of Theoretical Physics and Astrophysics, Xiamen University, Xiamen 361005, China.
authors.forename: Jiao
authors.initials: J
authors.lastname: Wang
authors.forename: Italo
authors.initials: I
authors.lastname: Guarneri
authors.forename: Giulio
authors.initials: G
authors.lastname: Casati
authors.forename: Jiangbin
authors.initials: J
authors.lastname: Gong