We report photomodulation spectroscopy measurements of the pressure dependence of the optical transition in alloys that is associated with the lowest Γ conduction band (termed subband). The pressure-induced energy shift of the transition is nonlinear and much weaker as compared to the change of the direct band gap of The weak pressure dependence of the transition can be fully understood based on the band anticrossing model in which the subband results from an interaction between the extended ZnMnTe conduction-band states and the localized O electronic states.
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