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- W209999080 abstract "We have performed a systematic magneto-optical Kerr spectroscopy study of GaMnAs with varying Mn densities. The Kerr angle strongly depends on the photon energy, exhibiting a large positive peak at $sim$1.7 eV. This peak increases in intensity and blue-shifts with Mn doping and further blue-shifts with annealing. We attribute these changes to the increased hole density and effective Mn content. Using a 30-band ${bf kcdot p}$ model with antiferromagnetic $p$-$d$ exchange interaction, we successfully reproduced the observed spectra without any ad hoc introduction of impurity transitions. Our theory also suggests that a sign change of Kerr angle should occur at much lower free hole densities than previously assumed. These results lead us to conclude that above-bandgap magneto-optical Kerr rotation in ferromagnetic GaMnAs is determined by interband transitions." @default.
- W209999080 created "2016-06-24" @default.
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- W209999080 date "2009-07-09" @default.
- W209999080 modified "2023-09-27" @default.
- W209999080 title "Magneto-optical Kerr Spectroscopy of GaMnAs: Interband or Impurity Transitions?" @default.
- W209999080 hasPublicationYear "2009" @default.
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