Interband Optical Properties of Concentric Type-I Nanorings in a Normal Magnetic Field
V. Arsoskia, M. Tadića and F.M. Peetersb
a Faculty of Electrical Engineering, University of Belgrade, P.O. Box 3554, 11120 Belgrade, Serbia
b Department of Physics, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
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Two concentric two-dimensional GaAs/(Al,Ga)As nanorings in a normal magnetic field are theoretically studied. The single-band effective mass approximation is adopted for both the electron and the hole states, and the analytical solutions are given. We find that the electronic single particle states are arranged in pairs, which exhibit anticrossings and the orbital momentum transitions in the energy spectrum when magnetic field increases. Their period is essentially determined by the radius of the outer ring. The oscillator strength for interband transitions is strongly reduced close to each anticrossing. We show that an optical excitonic Aharonov-Bohm effect may occur in concentric nanorings.
DOI: 10.12693/APhysPolA.117.733
PACS numbers: 73.21.La, 78.67.Hc