Undulation Spectra of GaP Associated with the Isoelectronic Trap N

Abstract
We describe "undulation spectra" in the luminescence of the isoelectronic trap N in GaP codoped with shallow acceptors. These novel spectra are shown to arise from an interference effect in the wave functions of electrons, arising from coherently scattering potentials due to pairs of N traps and neutral acceptors. The general phenomenon can occur in any indirect band-gap material.
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