Absence of localization in one-dimensional lattice with off-diagonal nonlinearity disorder

The time evolution of an initially localized mode in a one-dimensional latt ice with off-diagonal nonlinearity disorder is studied by solving a modifie d nonlinear Schrodinger equation. Absence of localization is found when the nonlinearity parameter is beyond the self-trapping region for correspondin g periodic lattice. The propagation of electrons shows ballistic behavior e ven in the presence of disorder. When self-trapping occurs, the untrapped p ortion still escapes ballistically.