Time evolution of wave-packets in quasi-1D disordered media

Year: 2000

Authors: Politi A., Ruffo S., Tessieri L.

Autors Affiliation: Istituto Nazionale di Ottica , Largo E. Fermi 6, 50125 Firenze, Italy;
Istituto Nazionale di Fisica della Materia, Firenze, Italy;
Dipartimento di Energetica “S. Stecco”, Università di Firenze, Via S. Marta 3, 50139 Firenze, Italy;
Istituto Nazionale di Fisica Nucleare, Firenze, Italy;
Instituto de Fisica, Universidad Autonoma de Puebla, Apdo. Postal J-48, Puebla, Pue. 72570, Mexico

Abstract: We have investigated numerically the quantum evolution of a delta-like wave-packet in a quenched disordered medium described by a tight-binding Hamiltonian with long-range hopping (band random matrix approach). We have obtained clean data for the scaling properties in time ana in the bandwidth b of the packet width (M) over bar and its fluctuations Delta((M) over bar) with respect to disorder realizations. We confirm that the fluctuations of the packet width in the steady-state show an anomalous scaling Delta((M) over bar)/(M) over bar similar to b(-delta) with delta = 0.75 +/- 0.03. This can be related to the presence of non-Gaussian tails in the distribution of (M) over bar. Finally, we have analysed the steady state probability profile and we have found 1/b corrections with respect to the theoretical formula derived by Zhirov in the b –> infinity limit, except at the origin, where the corrections are O(1/root b).

Journal/Review: EUROPEAN PHYSICAL JOURNAL B

Volume: 14 (4)      Pages from: 673  to: 679

KeyWords: BAND RANDOM MATRICES; SCALING PROPERTIES; QUANTUM CHAOS; LOCALIZATION; DIFFUSION
DOI: 10.1007/s100510051078

Citations: 5
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