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Eccentricity effects on the quantum confinement in double quantum rings
SOLID STATE COMMUNICATIONS, 151 (17): 1200-1204 (2011)
DOI: 10.1016/j.ssc.2011.03.037
Аннотация
This work presents a theoretical study of the energy spectrum of
GaAs/AlGaAs concentric double quantum rings, under an applied magnetic
field directed perpendicular to the ring plane. The Schrodinger equation
for this system is solved in a realistic model consisting of rings with
finite barrier potentials. Numerical results show that increasing the
magnetic field intensity leads to oscillations in the ground state
energy which, in contrast to the usual Aharonov-Bohm oscillations, do
not have a well defined period, due to the coupling between inner and
outer ring states. However, when one considers an elliptical geometry
for the rings, the energy spectra of the inner and outer ring states are
decoupled and the periodicity of the oscillations is recovered. (C) 2011
Elsevier Ltd. All rights reserved.
