We have studied quantum-well-confined holes based on the Luttinger-model description for the valence band of typical semiconductor materials. Even when only the lowest quasi-two-dimensional (quasi-2D) subband is populated, the static spin susceptibility turns out to be very different from the universal isotropic Lindhard-function lineshape obtained for 2D conduction-electron systems. The strongly anisotropic and peculiarly density-dependent spin-related response of 2D holes at long wavelengths should make it possible to switch between easy-axis and easy-plane magnetization in dilute magnetic quantum wells. An effective g factor for 2D hole systems is proposed.
@article{arxiv.1207.4548,
title = {Carrier-density-controlled anisotropic spin susceptibility of two-dimensional hole systems},
author = {T. Kernreiter and M. Governale and U. Zuelicke},
journal= {arXiv preprint arXiv:1207.4548},
year = {2013}
}
Comments
5+1 pages, 4+1 figures, RevTex 4.1, article + suppl. material to appear in Phys. Rev. Letters