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Type: Artigo de periódico
Title: GaAs-(Ga, Al) As double quantum rings: confinement and magnetic field effects
Author: Culchac, FJ
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 Ga(1-x)Al(x)As 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).
Country: Inglaterra
Editor: Iop Publishing Ltd
Citation: Journal Of Physics-condensed Matter. Iop Publishing Ltd, v. 20, n. 28, 2008.
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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