L. Hufnagel, R. Ketzmerick, T. Kottos, T. Geisel
Published 2001-01-10, updated 2001-08-28Version 2
We demonstrate for various systems that the variance of a wave packet $M(t)\propto t^\nu$, can show a {\it superballistic} increase with $2<\nu\le3$, for parametrically large time intervals. A model is constructed which explains this phenomenon and its predictions are verified numerically for various disordered and quasi-periodic systems.
Comments: 4 pages, 4 figures
Journal: Phys. Rev. E, vol. 64, 012301 (2001)
Delocalization of wave packets in disordered nonlinear chains
Spreading of wave packets in disordered systems with tunable nonlinearity
Single-particle excitations across the many-body localization transition in quasi-periodic systems
