Er-doped GaAs grown under special molecular beam epitaxy conditions emits strong luminescence at 1.54 mu m. The dominant transition of the spectrum was found to be extremely sharp (0.04 cm -1 ) at 4.2 K. Zeeman measurements on this specific transition give complicated angular dependence patterns. Analysis of data reveals monoclinic I symmetry (close to rhombic I) for the crystal field, with unexpectedly low g-factors (g 1y =2.0; g 2y =1.5) for the upper and the lower Kramers doublet states, all others being equal to zero, and the angle theta being (001) and z equal to 7 degrees . Preliminary crystal-field calculations and possible microscopic models are discussed.
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Thonke et al. (1988) studied this question.
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