INTRAEXCITONIC TRANSITIONS IN 2-DIMENSIONAL SYSTEMS IN A HIGH MAGNETIC-FIELD

The internal transitions of two-dimensional (2D) excitons in a high ma gnetic field B exhibit features due to the coupling of the internal an d center-of-mass motions. A study is made of these features, and it is shown that for magnetoexcitons with a center-of-mass momentum K not e qual 0 the energies of the strong transitions decrease with increasing K, and the absorption spectra show weakly resolved transitions, whose total intensity depends strongly on the exciton statistics (distribut ion function). (C) 1997 American Institute of Physics. [S00021-3640(97 )00421-0].