Abstract
Absorption spectra which originate from direct valence-band-to-conduction-band transitions in strained-layer superlattices (SLSs) are studied theoretically. The electronic structures are calculated by using the Luttinger-Kohn Hamiltonian in the Kronig-Penney model. The absorption coefficients are evaluated by taking the mixing of heavy- and light-hole states into account. As a result of calculation, firstly, origins of fine structures in the absorption spectra observed at a room temperature for type I ZnSe(22 A)–ZnS(23 A) SLS are clarified satisfactorily. Secondly, novel properties of type II ZnTe–ZnSe are predicted, i.e. it is revealed that the absorption intensity is one order of magnitude less in type II SLS than in type I SLS, and that in type II SLS the strength for any transitions to the higher conduction and from the higher valence subbands is greatly enhanced, in sharp contrast to the type I SLS.
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