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

✍ Scribed by T. Ferrus; B. Goutiers; L. Ressier; J.P. Peyrade; J. Galibert; J.A. Porto; J. Sánchez-dehesa

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 161 KB
• Volume: 25
• Category: Article
• ISSN: 0749-6036
• DOI: 10.1006/spmi.1998.0640

✦ Synopsis

We present the characterization of the band structure of GaAs/AlAs quantum-wire 1D superlattices performed by magnetophonon resonance with pulsed magnetic fields up to 35 T. The samples, generated by the 'atomic saw method' from original quantum-well 2D superlattices, underwent substantial modifications of their energy bands built up on the X-states of the bulk. We have calculated the band structure by a finite element method and we have studied the various miniband structures built up of the masses m t and m l of GaAs and AlAs at the point X. From an experimental point of view, the main result is that in the 2D case we observe only resonances when the magnetic field B is applied along the growth axis whereas in the 1D case we obtain resonances in all magnetic field configurations. The analysis of the maxima (or minima for B//E) in the resistivity ρ xy as a function of B allows us to account, qualitatively and semi-quantitatively, for the band structure theoretically expected.