CYCLOTRON AND INTERSUBBAND RESONANCE STUDIES IN [001] AND PIEZOELECTRIC [111] INAS (GA,IN)SB SUPERLATTICES/

Cyclotron resonance and inter-subband excitation experiments have been performed on superlattices of the semimetallic, strained type II syst em InAs/(Ga,In)Sb. We observe simultaneously one cyclotron resonance f rom the 2D electrons located in the InAs and two resonances from the 2 D holes in the (Ga,In)Sb layers. The two hole resonances originate fro m the M(J) = \3/2] states. We have found a strong crystallographic ani sotropy in the hole masses between structures grown along [001] and [1 11]A orientations attributed to the strain decoupling of the heavy and light hole levels in the Ga1-xInxSb valence band. In addition, we dem onstrate for the first time that intersubband resonances can be direct ly seen for the electrons at large tilt angles.