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VOLUME 62 (1995) | ISSUE 11 | PAGE 885
Magnetoexcitons in quantum rings and in antidots
An opening (antidot) in two-dimensional (2D) electron gas placed in a strong perpendicular magnetic field makes it 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 tunneling electron to hole around the antidot results in a shift for each of the excitons levels that oscillates with magnetic field.