Wannier-Stark levels in the valence band of semiconductor multiple quantum wells

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Abstract
We report on calculations of the in-plane dispersion of semiconductor multiple quantum wells subjected to a longitudinal electric field. At the in-plane zone center the decoupled heavy- and light-hole subbands split into evenly spaced Wannier-Stark ladders. Their in-plane dispersion relations display anticrossing behaviors which correspond either to intrawell interactions between the zone center light- and heavy-hole-states or to interactions between hole levels which are mainly localized in adjacent wells.