Intervalley electron scattering by phonons in (AlAs)1(GaAs)3(001) superlattices |
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Authors: | L N Nikitina S N Grinyaev V G Tyuterev |
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Institution: | (1) Kuznetsov Siberian Physicotechnical Institute, Tomsk State University, pl. Revolyutsii 1, Tomsk, 634050, Russia;(2) Tomsk State Pedagogical University, Tomsk, 634041, Russia |
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Abstract: | Intervalley electron scattering by phonons in (AlAs)1(GaAs)3(001) superlattices is studied using the pseudopotential method and a phenomenological model of the bonding forces. The deformation
potentials between the conduction band extrema of the superlattice involving short-and long-wavelength phonons are calculated.
It is shown that the mixing of states from the zinc-blende L valleys plays a greater role in intervalley scattering in a superlattice than the Γ-X mixing. In particular, due to L-L mixing, the Γ-X
3 transitions, analogous to Γ-L transitions in zinc blende, have higher intensities than the analogues of Γ-X transitions (Γ1-M
5 and (Γ1-Γ3 transitions). The deformation potentials averaged over the scattering channels in the superlattice agree with the corresponding
potentials in a solid solution, but all transitions in the superlattice have higher intensities for the lower states. |
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