Cm. Hu et al., SPIN-SPLIT CYCLOTRON-RESONANCE AND SPATIAL-DISTRIBUTION OF INTERACTING ELECTRONS, Physical review. B, Condensed matter, 52(16), 1995, pp. 12090-12094
The interaction coupling of cyclotron transitions with different spin
orientation was investigated as a function of density for electron inv
ersion layers in GaAs in the magnetic quantum limit. The spatial elect
ron distribution strongly influences the coupling of the electrical di
pole transitions, resulting in deviations from the interaction strengt
h for ideally two-dimensional electrons. At the higher densities the c
oupling is essentially reduced due to the finite thickness of the inve
rsion layer, whereas at sufficiently low densities the coupling reflec
ts the influence of disorder.