Effect of intersubband scattering on weak localization in two-dimensional systems

Abstract

The theory of weak localization is generalized for multilevel 2D systems taking into account intersubband scattering. It is shown that weak intersubband scattering which is negligible in a classical transport, affects strongly the weaklocalization correction to conductivity. The anomalous magnetoresistance is calculated in the whole range of classically low magnetic fields. This correction to conductivity is shown to depend strongly on the ratios of occupied level concentrations. It is demonstrated that at relatively low population of the excited subband, it is necessary to use the present theory because the highfield limit asimptotics is shown to be achieved only in classical magnetic fields.

Intervalley scattering and weak localization in Si-based two-dimensional structures

“…where the terms ∆σ (a) and ∆σ (b) correspond to the standard diagrams, which have been considered in detail in Refs. [17,19,20]. We neglect both valley and spinorbit splitting in Si MOS structures.…”

Anomalous dephasing of two-dimensional electrons in an AlGaAs/GaAs parabolic quantum well structure

“…WL in a two-dimensional system with two occupied subbands has been theoretically studied [14,15]. It was shown that if short-range scattering is dominant and intersubband scattering is strong, the subbands couple and the electrons behave as if they occupy a single subband characterized by an average kinetic parameter.…”

Simple mechanism that breaks the Hall effect linearity at low temperatures

“…We believe that a crucial factor is a scattering between different types of charge carriers. Indeed, as it was shown for multiband compounds [22], multivalley systems [23,24], and topological insulators [25], if we take into account the scattering between different types of the quasi-particles, a multicomponent system effectively reduces to a single-component one from the view point of the weak localization/antilocalization.…”