STUDY OF THE ENERGY-BANDS OF A COUPLED QUANTUM-WIRE SUPERLATTICE BY MAGNETO-PHONON RESONANCE

We report magneto-phonon resonance measurements to study the effects t hat the restructuring of space produces on the allowed energies of a 2 D delta-doped superlattice sample due to its transformation on a 1D co upled quantum wire superlattice by the atomic saw method. New gaps and new effective masses appear in some favoured directions. We use a gen eralization of the Kane model applied to the case of a degenerated sam ple with an anisotropic subband dispersion including non-parabolicity effects. This procedure allows us to analyse cyclotron frequencies and assign them to each ''old gap'' (2D) or ''new ones'' (1D) for differe nt magnetic field configurations. We have characterised modifications and restructuring which occurred in the first Brillouin zone. during t he sample structuration. Direct measurements of the mean angle of the slipping layers and the estimation of new anisotropic effective masses near the Fermi level have also been performed. The results obtained p rove the quantum character of the method used to generate the quantum wire superlattice.