Determination of the five first interband transitions above the lowest indirect band gap of the aluminum antimonide

Electroreflectance measurements allowed us to determine the Γ₈ᵛ→L₆ᶜ, Γ₈ᵛ→Γ₆ᶜ, L4,5ᵛ→L₆ᶜ, Γ₇ᵛ→Γ₆ᶜ, and L₆ᵛ→L₆ᶜ AlSb transition energies from 25 to 295 K. At room temperature the Γ₈ᵛ→L₆ᶜ and Γ₈ᵛ→Γ₆ᶜ energies are, respectively, 2.211 and 2.300 eV; the spin-orbit splittings Γ₈ᵛ-Γ₇ᵛ and L4,5ᵛ-L₆ᵛ are, respectively, 673 and 427 meV. The L4,5ᵛ→L₆ᶜ transition energy is 2.890 eV.