Abstract
A self-consistent calculation of the density of states and the spectral density function is performed in a two-dimensional spin-polarized hole system based on a multiple-scattering approximation. Using parameters corresponding to GaMnAs thin layers, a wide range of Mn concentrations and hole densities have been explored to understand the nature, localized or extended, of the spin-polarized holes at the Fermi level for several values of the average magnetization of the Mn system. If the impurity concentration is below a certain threshold, the increase of the magnetization does not lead to a significant change in the localized character of the spin-polarized states. Above this threshold, we reach conditions allowing the occurrence of spin-polarized extended states at the Fermi level—more properly extended states in a very dirty metal—which are very sensitive to the average magnetization. The occurrence of a metal-to-non-metal transition has been surveyed around an optimum combination of the Mn concentration and the free carriers density.
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Dias Cabral, E., da Cunha Lima, I.C., Boselli, M.A. et al. The Non-Metal-to-Metal and Vice-Versa Transitions in a GaMnAs Layer. J Supercond Nov Magn 20, 421–427 (2007). https://doi.org/10.1007/s10948-007-0241-8
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DOI: https://doi.org/10.1007/s10948-007-0241-8