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Linear and nonlinear optical properties of semiconductor nanorings with magnetic field and disorder - Influence on excitons and biexcitons
Authors:T Meier  P Thomas  SW Koch
Institution:(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
Keywords:PACS  71  35  Cc Intrinsic properties of excitons  optical absorption spectra –  78  66  -w Optical properties of specific thin          films –  42  50  Md Optical transient phenomena: quantum beats  photon echo  free-induction decay  dephasings and revivals  optical          nutation  and self-induced transparency –  03  65  Bz Foundations  theory of measurement  miscellaneous theories
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