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We present the characterization of the band structure of GaAs/AlAsquantum-wire 1D superlattices performed by magnetophonon resonance with pulsedmagnetic fields up to 35 T. The samples, generated by the "atomic saw method"from original quantum-well 2D superlattices, underwent substantialmodifications of their energy bands built up on the X-states of the bulk. Wehave calculated the band structure by a finite element method and we havestudied the various miniband structures built up of the masses m_t and m_l ofGaAs and AlAs at the point X. From an experimental point of view, the mainresult is that in the 2D case we observe only resonances when the magneticfield B is applied along the growth axis whereas in the 1D case we obtainresonances in all magnetic field configurations. The analysis of the maxima (orminima for B // E) in the resistivity rho_xy as a function of B allows us toaccount, qualitatively and semi-quantitatively, for the band structuretheoretically expected.

Study and characterization by magnetophonon resonance of the energy structuring in GaAs/AlAs quantum-wire superlattices