VALENCE-BAND-SHAPE MODIFICATION DUE TO BAND COUPLING IN STRAINED QUANTUM-WELLS

[摘要] We have observed the strong dependence of the in-plane effective masses of the heavy-hole and light-hole valence bands in quantum wells on their coupling. The magnitude of this interaction, which is a function of the energy separation of the two bands, was tuned by adjusting the magnitude of tensile strain and well width in GaAs1-yPy/Al0.35Ga0.65As quantum wells. A distinct increase of both the heavy- and light-hole masses is observed when the bands merge at k = 0, consistent with theoretical predictions.

[关键词] UNIAXIAL-STRESS;HOLE SUBBANDS;LIGHT-HOLE;SUPERLATTICES;REVERSAL