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- W2004458113 abstract "The photoluminescence of copper-doped high-purity epitaxial GaAs in the near-gap region is investigated as a function of excitation intensity, temperature, and an external magnetic field up to 5.7 T. Sharp emission lines are identified as originating from the recombination of excitons bound to neutral-copper-complex centers of ${C}_{3ensuremath{nu}}$ and ${C}_{2ensuremath{nu}}$ symmetry with ionization energies of 156 and about 450 meV, respectively. The spectrum exhibits replicas of these lines, which are due to the simultaneous excitation of resonant modes of 3.6- and 6.1-meV energy. The relative intensities obey a Poisson distribution law. The dissociation of the bound excitons takes place in a two-step process: First a free single particle is liberated, whereas at higher temperatures free-electron-hole pairs are created. The linear dependence of the luminescence on the excitation intensity leads to the conclusion that photocreated coupled electron-hole pairs are trapped directly by the binding center. A group-theoretical analysis of the Zeeman pattern attributes the different lines to the appropriate electronic transitions between states of the double groups ${C}_{3ensuremath{nu}}$ and ${C}_{2ensuremath{nu}}$. The crystal field is sufficiently strong to completely decouple the $|{m}_{j}|=frac{1}{2} mathrm{and} frac{3}{2}$ levels of the acceptor ground state. The $|{m}_{j}|=frac{3}{2}$ state is degenerate with the valence-band continuum." @default.
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- W2004458113 date "1973-03-15" @default.
- W2004458113 modified "2023-10-05" @default.
- W2004458113 title "Optical Properties of Excitons Bound to Copper-Complex Centers in Gallium Arsenide" @default.
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- W2004458113 doi "https://doi.org/10.1103/physrevb.7.2473" @default.
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