M. Hubner et al., SUPERRADIANT COUPLING OF EXCITONS IN (IN,GA)AS MULTIPLE-QUANTUM WELLS, Physica status solidi. b, Basic research, 206(1), 1998, pp. 333-339
The third order nonlinear optical response at the heavy-hole (hh) exci
ton resonance in a wedge-shaped multiple quantum well structure close
to the Bragg resonance is investigated using time-integrated and spect
rally resolved degenerate four-wave mixing. Effective interwell excito
n-exciton interaction due to photon exchange is demonstrated by studyi
ng the signals in backward direction for different widths of the barri
ers.