STRAIN RECONSTRUCTION OF THE VALENCE BAND IN GA1-XINXSB GASB QUANTUM-WELLS

We report measurements of the dispersion relation for holes in the Mj= 3 2 strain split valence band in Ga - xInxSb/GaSb quantum wells. The strain decoupling of the Mj= 3 2 and Mj= 1 2 levels gives the Mj= 3 2 ∼ 0.07 m0) for in-plane motion. The band is found to be highly non-parabolic, and the change in mass has been modelled directly using a full Luttinger-Kohn Hamiltonian calculation. Good agreement with experiment is achieved. Inter-band magneto-absorption experiments agreed with the low hole masses observed in cyclotron resonance and extended the study to higher energies in both the conduction and valence band. © 1990.