title: Fingerprints of the anisotropic spin-split hole dispersion in resonant inelastic light scattering in two-dimensional hole systems.
abstract: In resonant inelastic light scattering experiments on two-dimensional hole systems in GaAs-Al(x)Ga(1-x)As single quantum wells we find evidence for the strongly anisotropic spin-split hole dispersion at finite in-plane momenta. In all our samples we detect a low-energy spin-density excitation of a few meV, stemming from excitation of holes of the spin-split ground state. The detailed spectral shape of the excitation depends sensitively on the orientations of the linear light polarizations with respect to the in-plane crystal axes. In particular, we observe a doublet structure, which is most pronounced if the polarization of the incident light is parallel to the [110] in-plane direction. Theoretical calculations of the Raman spectra based on a multiband k · p approach confirm that the observed doublet structure is due to the anisotropic spin-split hole dispersion.
authors.affiliation: Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Hirmer
authors.forename: M
authors.initials: M
authors.lastname: Hirmer
authors.forename: D
authors.initials: D
authors.lastname: Schuh
authors.forename: W
authors.initials: W
authors.lastname: Wegscheider
authors.forename: T
authors.initials: T
authors.lastname: Korn
authors.forename: R
authors.initials: R
authors.lastname: Winkler
authors.forename: C
authors.initials: C
authors.lastname: Schüller