THEORY FOR THE CYCLOTRON-RESONANCE OF HOLES IN STRAINED ASYMMETRIC GE-SIGE QUANTUM-WELLS

We present calculations of hole Landau levels, cyclotron masses, acid far-infrared spectra for strained asymmetric p-type Ge-SixCe1-x quantu m wells in a perpendicular magnetic field in order to interpret recent experimental results by Engelhardt et al. [Solid State Electron. 37, 949 (1994)]. Self-consistent hole subband calculations are combined wi th calculations of the Landau levels using a 6 x 6 k . p Hamiltonian f or the topmost Gamma(8) and Gamma(7) bulk valence bands. Our results a re in very good agreement with the experimental data. Taking into acco unt the coupling to the split-off band turns out to be important. The complex spectra of hole Landau levels in strained quantum wells remind one of the well known quantum resonance spectra of bulk p-type Ge und er uniaxial stress.