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Type: Artigo de periódico
Title: Gaas-(ga, Al)as Double Quantum Rings: Confinement And Magnetic Field Effects
Author: Culchac F.J.
Porras-Montenegro N.
Latge A.
Abstract: Here we address a theoretical study of concentric GaAs-(Ga, Al)As double quantum rings, under a magnetic field applied perpendicularly to the ring plane. Electron-hole transition energies are calculated as a function of the system geometry confinement, following a single-particle picture, neglecting interaction effects. We adopted an effective-mass approximation, within a hard potential model calculation, exactly solved by using confluent hypergeometric functions. A huge dependence on the barrier width value and on the external ring width of the Ga1-xAlxAs coupled rings is found for the transition energy values. The results show a high competition between geometric and magnetic-field confinement, leading to an increase of the electron-hole energies with the magnetic field, and a reducing behavior as the outer ring width is assumed to be larger. Our results are in quite good agreement with the experimental data by Mano et al (2005 Nano Lett. 5 425). © 2008 IOP Publishing Ltd.
Rights: fechado
Identifier DOI: 10.1088/0953-8984/20/28/285215
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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