EFFECTS OF A FINITE ELECTRIC-FIELD ON THE LOCALIZATION IN ANISOTROPIC2-DIMENSIONAL SYSTEMS

Citation
P. Kleinert et Vv. Bryksin, EFFECTS OF A FINITE ELECTRIC-FIELD ON THE LOCALIZATION IN ANISOTROPIC2-DIMENSIONAL SYSTEMS, Journal of physics. Condensed matter, 7(26), 1995, pp. 5075-5082
Citations number
18
Categorie Soggetti
Physics, Condensed Matter
ISSN journal
09538984
Volume
7
Issue
26
Year of publication
1995
Pages
5075 - 5082
Database
ISI
SICI code
0953-8984(1995)7:26<5075:EOAFEO>2.0.ZU;2-E
Abstract
The direct influence of a d.c. electric field on weak localization is investigated on the basis of a quantum diffusion model for an anisotro pic two-dimensional electron gas. The anisotropy is treated both in a model of anisotropic effective masses and in a tight-binding model for parallel chains. The crossover of the delocalization edge from a powe r-law 1D-like dependence to an exponential decrease, characteristic fo r a 2D system, is investigated. The appearance of a delocalization edg e gives rise to a long-time power-law current relaxation according to j(t) similar to 1/root t, independently of the anisotropy.