SPATIAL CORRELATION OF LASER-GENERATED ELECTRONS AND HOLES IN QUANTUM-WELLS

The spatial correlation of hot electrons and holes generated by light in a semiconductor quantum well (QW) is studied. For hot electron-hole pairs in a polar material, this correlation is determined by the inte raction with LO-phonons. We analyze the distribution F-N(r,K) of elect rons and holes which are created in a given light absorption process, with respect to their relative separation r and total quasimomentum HB ARK, after the emission of a number N of LO-phonons. The relationship between the spatial distribution of electrons and holes in these inter mediate states and the cross-section of multi-phonon resonant Raman sc attering (MPRRS) is established. Spatial correlation effects are stron gly enhanced in low-dimensional systems, a fact which is also reflecte d in the MPRRS efficiency.