Study of a Partly Spin-Polarized Two-Dimensional Electron System, According to Time-Resolved Magneto-Optical Kerr Rotation

Abstract

A spin-depolarized electron system with filling factor ν = 1 in a GaAs quantum well is investigated according to time-resolved Kerr rotation. A transition from a new spin-correlated state to one with the low spin stiffness characteristic of a single-particle electron system is observed at temperatures above 5 K. A nonlinear contribution to the Larmor oscillations decay is distinguished at low temperatures, where spin–spin correlations determine the ground state of a two-dimensional electron system. The parameters of the fluctuating magnetic field acting on individual electron spins are determined.