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• W2029353066 abstract "A detailed investigation on optical properties of the characteristic-orange-luminescence (COL) center in GaP is reported, combining photoluminescence data with dye-laser-excited excitation spectra. Evidence from the doping conditions required to produce this defect suggests an identification of the COL center with a defect containing Cu only. The novel optical data support this view, since the COL spectrum is identified as originating from an exciton bound to a nonlinear isoelectronic ${mathrm{Cu}}_{I}ensuremath{-}{mathrm{Cu}}_{mathrm{Ga}}ensuremath{-}{mathrm{Cu}}_{I}$ associate. The complicated local mode coupling and the rather strong coupling to the lattice continuum modes is expected for such a defect structure, where the ${mathrm{Cu}}_{mathrm{Ga}}$ can be considerably relaxed. The strong compressive axial strain field created by this defect causes a splitting of the hole states at the defect and decouples the spin and orbital angular momentum of these states. For a complete decoupling the bound exciton is formed by combining a pure spin hole state and an electron. This results in the observed $J=1$ spin triplet as the lowest bound exciton state and a higher $J=0$ singlet state. From the rich structure observed in excitation spectra a large exchange splitting of 23.2 meV is obtained between the $J=1$ ground state and the $J=0$ state. No orbitally excited states of one particle in the Coulomb field of the other are observed for this bound exciton, probably a consequence of the fact that both electronic particles are relatively deeply bound. A typical feature for this class of defects seems to be that transitions involving the singlet $J=0$ state have a much stronger total oscillator strength than those involving the $J=1$ ground state. This is a consequence of a spin selection rule $ensuremath{Delta}S=0$, also manifested by the long decay time of the $J=1$ bound exciton emission ($ensuremath{tau}ensuremath{approx}100$ ensuremath{mu}s)." @default.
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• W2029353066 date "1982-06-15" @default.
• W2029353066 modified "2023-10-14" @default.
• W2029353066 title "Optical properties of the Cu-related characteristic-orange-luminescence center in GaP" @default.
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• W2029353066 doi "https://doi.org/10.1103/physrevb.25.7719" @default.
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