Bloch-like oscillations in a one-dimensional lattice with long-range correlated disorder.
We study the dynamics of an electron subjected to a uniform electric field within a tight-binding model with long-range-correlated diagonal disorder. The random distribution of site energies is assumed to have a power spectrum S(k) approximately 1/k(alpha) with alpha>0. de Moura and Lyra [Phys. Rev. Lett. 81, 3735 (1998)]] predicted that this model supports a phase of delocalized states at the band center, separated from localized states by two mobility edges, provided alpha>2. We find clear signatures of Bloch-like oscillations of an initial Gaussian wave packet between the two mobility edges and determine the bandwidth of extended states, in perfect agreement with the zero-field prediction.
Domínguez-Adame
F
F
GISC, Departamento de Física de Materiales, Universidad Complutense, E-28040 Madrid, Spain.
Malyshev
V A
VA
de Moura
F A B F
FA
Lyra
M L
ML