Carrier-density-controlled anisotropic spin susceptibility of two-dimensional hole systems
arXiv:1207.4548 · doi:10.1103/PhysRevLett.110.026803
Abstract
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.
arXiv comment5+1 pages, 4+1 figures, RevTex 4.1, article + suppl. material to appear in Phys. Rev. Letters
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