Anisotropic In-Plane Magnetoresistance and Spin Susceptibility of Dilute Two-Dimensional Holes in (100) GaAs Heterostructure

Abstract

The in-plane magnetoresistance of dilute two-dimensional holes in a (100) GaAs heterostructure has been measured for various directions of a parallel magnetic field. The magnetoresistance exhibits a strong anisotropy, and changes its field dependence at a field corresponding to the full spin depopulation. The spin susceptibility deduced from the depopulation field also shows a strong anisotropy at higher densities while the anisotropy is absent at a lower density.