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Type: Artigo de periódico
Title: Electronic Structures Of Modulated Bidimensional Systems In The Presence Of A Magnetic Field
Author: Andrade Neto M.A.
Schulz P.A.
Abstract: Recent advances in nanotechnology allow a periodic modulation of bidimensional electronic systems, like the electron gas that forms at the heterojunction of GaAs-AlGaAs. An artificial bidimensional crystal is originated by this modulation and the corresponding Fermi surface could be measured by magneto-transport techniques. In the present work the electronic structure of such a system is calculated within the framework of a tight-binding model. The bidimensional array is considered to have two types of sites, in which we originate potential barriers (the modulation) that are periodic in the host array. Magnetic field effects are introduced by means of a Peierls substitution. The limits of a weak and strong modulation are discussed. In both limits the electronic structure shows Hofstadter like spectra in some energy ranges. We analyse the modification of these spectra due to interband coupling and the transition between the mentioned limits.
Rights: fechado
Identifier DOI: 
Date Issue: 1996
Appears in Collections:Unicamp - Artigos e Outros Documentos

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