Systematic study of Mn-doping trends in optical properties of (Ga,Mn)As

Details Systematic study of Mn-doping trends in optical properties of (Ga,Mn)As Systematic study of Mn-doping trends in optical properties of (Ga,Mn)As

2010-07-27

arxiv.org/abs/1007.4708v1

Physics

Condensed Matter

Materials Science

22 pages, 14 figures

Scientific paper

We report on a systematic study of optical properties of (Ga,Mn)As epilayers spanning the wide range of accessible substitutional Mn_Ga dopings. The growth and post-growth annealing procedures were optimized for each nominal Mn doping in order to obtain films which are as close as possible to uniform uncompensated (Ga,Mn)As mixed crystals. We observe a broad maximum in the mid-infrared absorption spectra whose position exhibits a prevailing blue-shift for increasing Mn-doping. In the visible range, a peak in the magnetic circular dichroism blue shifts with increasing Mn-doping. These observed trends confirm that disorder-broadened valence band states provide a better one-particle representation for the electronic structure of high-doped (Ga,Mn)As with metallic conduction than an energy spectrum assuming the Fermi level pinned in a narrow impurity band.

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