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VOLUME 62 (1995) | ISSUE 11 | PAGE 885
Magnetoexcitons in quantum rings and in antidots
An opening (antidot) in a two-dimensional (2D) electron gas in a strong perpendicular magnetic field makes possible the formation of ring-shaped excitons stemming from the skipping states of electrons and holes. The binding energy of the ground states of such excitons is logarithmically larger than that of the "bulk" 2D excitons. The possibility of electron-to-hole tunneling around the antidot results in a shift for each of the excitonic levels, which oscillates as a function of the magnetic field. © 7995 American Institute of Physics.