Effects of pressure on the band structure of highly mismatched Zn1−yMnyOxTe1−x alloys

We report photomodulation spectroscopy measurements of the pressure dependence of the optical transition in Zn1−yMnyOxTe1−x alloys that is associated with the lowest Γ conduction band (termed E− subband). The pressure-induced energy shift of the E− transition is nonlinear and much weaker as compared to the change of the direct band gap of Zn0.88Mn0.12Te. The weak pressure dependence of the E− transition can be fully understood based on the band anticrossing model in which the E− subband results from an interaction between the extended ZnMnTe conduction-band states and the localized O electronic states.