Effects of pressure on the band structure of highly mismatched Zn 1-yMn yOxTe1-x alloys

Shan, W.; Yu, K.M.; Walukiewicz, W.; Beeman, J.W.; Wu, J.; Ager III, J.W.; Scarpulla, M.A.; Dubon, O.D.; Haller, E.E.
February 2004
Applied Physics Letters;2/9/2004, Vol. 84 Issue 6, p924
Academic Journal
We report photomodulation spectroscopy measurements of the pressure dependence of the optical transition in Zn[sub 1-y]Mn[sub y]O[sub x]Te[sub 1-x] alloys that is associated with the lowest Γ conduction band (termed E[sub -] subband). The pressure-induced energy shift of the E[sub -] transition is nonlinear and much weaker as compared to the change of the direct band gap of Zn[sub 0.88]Mn[sub 0.12]Te. The weak pressure dependence of the E[sub -] transition can be fully understood based on the band anticrossing model in which the E[sub -] subband results from an interaction between the extended ZnMnTe conduction-band states and the localized O electronic states. © 2004 American Institute of Physics.


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