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• W2044356911 abstract "Abstract In this note we determine the oscillator strengths for the dipole absorption of neutral bound excitons in direct gap semiconductors, using our previously obtained 35-term Page and Fraser type wave function, and taking into account the detailed electronic structure as well as the electron-hole exchange interaction. The envelope part of the oscillator strengths varies considerably with the electron-hole mass ratio σ = m ∗ e m ∗ h , and is maximum for the (D0, X)- complex when σ = 0.4. For typical σ-values (σ≅ 0.1–0.2), ƒ (D 0 ,X) ≅ 10ƒ (A 0 ,X) . But when σ approaches zero, the overlapping of the electron and the hole envelope wave functions of the (A0,X)-complex decreases progressively so that the oscillator strength also decreases and tends to zero. In the case of zinc-blende materials (Td) and positive spin-orbit coupling at k = 0 , we confirm that the line strength for transitions to or from J = 1 2 (Γ 6 ) or J = 5 2 (Γ 7 + Γ 8 ) level of the (A0, X)-complex is equal to one quarter of the line strength to or from the J = 3 2 (Γ 8 ) level. In the case of CdS, where our computed values are only in qualitative agreement with the experimental values, we discuss the use of the phenomenological result of Rashba." @default.
• W2044356911 created "2016-06-24" @default.
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• W2044356911 date "1982-09-01" @default.
• W2044356911 modified "2023-09-30" @default.
• W2044356911 title "Optical absorption by neutral bound excitons" @default.
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• W2044356911 doi "https://doi.org/10.1016/0038-1098(82)90852-3" @default.
• W2044356911 hasPublicationYear "1982" @default.
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