Weak localization in macroscopically inhomogeneous two-dimensional systems: a simulation approach

Abstract

A weak-localization effect has been studied in macroscopically inhomogeneous 2D system. It is shown, that although the real phase breaking length tends to infinity when the temperature tends to zero, such a system can reveal a saturated behavior of the temperature dependence of that parameter, which is obtained from the standard analysis of the negative magnetoresistance and usually identified by experimentalists with the phase braking length.

Experimental study of weak antilocalization effects in a high-mobilityInxGa1−xAStudenikin1, Coleridge2, Ahmed3 et al. 2003Phys. Rev. B748570View full textAdd to dashboardCite

“…The saturation below 1K suggests some additional phase-breaking mechanisms limit τ ϕ . Possibilities include inhomogeneous distribution of alloy composition, interface roughness or doping concentration variations 18,20,22 . In high mobility samples such as that studied here small fluctuating magnetic fields may also be playing a role.…”

Magnetoresistance and dephasing in a two-dimensional electron gas at intermediate conductances

“…Some of these reasons have been understood. These are the influence of δ-doped layers [36], dynamical defects [37], and macroscopic inhomogeneities [38] on the phase relaxation time, the temperature dependence of the mobility of electrons in quantum well due to temperature dependent disorder in the doped layers [39], and the scattering on magnetic impurities [40]. Nevertheless, the results obtained in Ref.…”

Влияние магнитных частиц Co-CoO на свойства электропереноса в однослойном графене

“…При этом, согласно теории квантовых поправок [36][37][38], температурные зависимости времени сбоя фазы τ ϕ волновых функций электронов имеют степенной вид…”