Optimized electron propagation on a quantum chain by a topological phase

TitleOptimized electron propagation on a quantum chain by a topological phase
Publication TypeJournal Article
Year of Publication2009
AuthorsPaganelli, S, Giorgi, GL, de Pasquale, F
JournalFortschritte der Physik
Volume57
Issue11-12
Pagination1094–1102
ISSN00158208
Abstract

We study the quantum diffusion of an electron in a quantum chain starting from an initial state localized around a given site. As the wavepacket diffuses, the probability of reconstructing the initial state on another site diminishes drastically with the distance. In order to optimize the state transmission we find that a topological quantum phase can be introduced. The effect of this phase is the reduction of wavepacket spreading together with almost coherent group propagation. In this regime, the electron has a quasi-linear dispersion and high fidelity can be achieved also over large distances in terms of lattice spacing.

URLhttp://doi.wiley.com/10.1002/prop.200900087
DOI10.1002/prop.200900087
Campus d'excel·lència internacional U A B