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|Type:||Artigo de periódico|
|Title:||Gaas-(ga, Al)as Double Quantum Rings: Confinement And Magnetic Field Effects|
|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.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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