MAGNETOOPTICAL STUDY OF EXCITONIC STATES IN 2DEGS NEAR FILLING FACTORV=1

We report a systematic study of PL processes in 2DEGs close to the v = 1 quantum Hall state. The critical importance of the Coulomb interact ion between the photo-excited hole and the 2DEG is demonstrated in a s tructure where we can vary the electric field across the QW and thus t he electron-hole separation. We find bound states form between the pho to-excited valence band hole and quasiparticle excitations of the v = 1 state, as well as ''shake-up'' of spin-wave excitations upon recombi nation. (C) 1998 Elsevier Science B.V. All rights reserved.