We investigate effects of lateral confinement on spin splitting of energy levels in 2D hole gases grown on [311] GaAs. We found that lateral confinement enhances anisotropy of spin splitting relative to the 2D gas for both confining directions. Unexpectedly, the effective g-factor does not depend on the 1D energy level number N for B∥[01ˉ1] while it has strong N-dependence for B∥[2ˉ33]. Apart from quantitative difference in the spin splitting of energy levels for the two orthogonal confinement directions we also report qualitative differences in the appearance of spin-split plateaus, with non-quantized plateaus observed only for the confinement in [01ˉ1] direction. In our samples we can clearly associate the difference with anisotropy of spin-orbit interactions.
@article{arxiv.0802.4271,
title = {Anisotropic modification of the effective hole $g$-factor by electrostatic confinement},
author = {S. P. Koduvayur and L. P. Rokhinson and D. C. Tsui and L. N. Pfeiffer and K. W. West},
journal= {arXiv preprint arXiv:0802.4271},
year = {2009}
}