Spin-dependent transport in a two-dimensional GaAs electron gas in a parallel magnetic field

Abstract

We report low-temperature magnetoresistivity measurements of high-quality gated two-dimensional (2D) electron systems. In the dilute electron density limit, we show evidence for spin polarisation in an in-plane magnetic field. Using a simple model, we estimate the Landé g-factor in this dilute two-dimensional electron gas to be about 3.32. The enhanced Landé g-factor compared with that of a bulk GaAs 2D electron system (0.44) is ascribed to electron–electron interaction effects at ultra-low electron densities.