(1) Department of Physics and Material Sciences Center, Philipps University, Renthof 5, 35032 Marburg, Germany, DE
Abstract:
Linear and nonlinear optical absorption spectra are studied theoretically for semiconductor nanorings penetrated by a magnetic
field. Due to the Aharanov-Bohm effect the spectral position as well as the oscillator strength of the exciton change periodically
as function of the magnetic flux enclosed by the ring. In the nonlinear differential absorption spectra it is found that the
magnetic field strongly modifies Coulomb many-body correlations. In particular, the magnetic-field-induced increase of the
exciton binding energy is accompanied by a decrease of the biexciton binding energy. The persistence of these effects in the
presence of energetic disorder is analyzed.
Received 31 January 2001