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Influence de la densité de trous sur la dynamique des charges et de l'aimantation du (Ga, Mn)As en couche

Abstract : The effects of the background hole density on the charge and magnitude of the magnetization dynamics in (Ga,Mn)As grown with independently fixed manganese and impurity densities. A pump and probe experiment monitored simultaneously the reflectivity and Kerr angle dynamics. Two relaxation steps are highlighted. First the cooling down of the charge clouds between 1ps and 100ps and second the carrier’s diffusion-recombination between 100ps and 1.500 ns. The latter depends on the ratio between the spatial extent of impurity states, which trap the photo electrons, and the Fermi velocity. To complete these experimental results, a numerical study of the ground state of the samples, using a density functional theory, relates the magnitude of the magnetization, the temperature of the carriers and the density of holes. Phase diagram are computed, and compared to already published results. We show that the magnitude of the magnetization dynamics can be fully determined from the reflectivity measurements. We conclude that it is possible to distinguish the dynamics of the magnetization magnitude and direction using the Kerr angle dynamical signal.
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Jean Besbas. Influence de la densité de trous sur la dynamique des charges et de l'aimantation du (Ga, Mn)As en couche. Autre. Université de Strasbourg, 2012. Français. ⟨NNT : 2012STRAE022⟩. ⟨tel-00798208⟩

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