Ultrafast Dynamics of Coherent Acoustic Phonons in the Ferromagnetic GaMnAs/GaAs System

Details Ultrafast Dynamics of Coherent Acoustic Phonons in the Ferromagnetic GaMnAs/GaAs System Ultrafast Dynamics of Coherent Acoustic Phonons in the Ferromagnetic GaMnAs/GaAs System

2008-07-10

arxiv.org/abs/0807.1740v1

Physics

Condensed Matter

Materials Science

4 pages,3 figures

Scientific paper

We observed pronounced oscillations in the reflectivity curves of ferromagnetic Ga$_{1-x}$Mn$_x$As/GaAs heterostructures using pump-probe spectroscopy that are caused by coherent acoustic phonons propagating through the sample. The changes in the oscillation period, damping and amplitude as the phonons travel across the Ga$_{1-x}$Mn$_x$As/GaAs interface reflect strong differences in the electronic structures and optical properties of these materials. Analysis of the oscillation amplitude indicates a transition region from Ga$_{1-x}$Mn$_x$As to GaAs substrate.

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