Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5457412 | Solid State Communications | 2016 | 16 Pages |
Abstract
We investigate electronic transport in a one-dimensional model with four different types of atoms and long-ranged correlated disorder. The latter was attained by choosing an adequate distribution of on-site energies. The wave-packet dynamics is followed by taking into account effects due to a static electric field and electron-phonon coupling. In the absence of electron-phonon coupling, the competition between correlated disorder and the static electric field promotes the occurrence of wave-packet oscillations in the regime of strong correlations. When the electron-lattice coupling is switched on, phonon scattering degrades the Bloch oscillations. For weak electron-phonon couplings, a coherent oscillatory-like dynamics of the wave-packet centroid persists for short periods of time. For strong couplings the wave-packet acquires a diffusive-like displacement and spreading. A slower sub-diffusive spreading takes place in the regime of weak correlations.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
L.D. da Silva, M.O. Sales, A. Ranciaro Neto, M.L. Lyra, F.A.B.F. de Moura,