Optical nonlinearities and phase coherence in CdSe studied by transient four-wave mixing

Coherent and Incoherent Exciton Dynamics in Al1−yGayAs/GaAs Multiple Quantum Wells

“…The T,-value deduced from an extrapolation to zero temperature is with 50 ps rather long, reflecting the high quality of sample 227. Values of T, in the 10 to 50 ps region seem to be typical for free excitons at low temperatures and densities in high quality 2d and 3d samples [6,34,3.51. For localized or bound excitons this value can be considerably larger, depending on the material and on the excitation conditions [36].…”

Exciton dephasing in ZnSe quantum wires

“…1-7͒ and II-VI compounds [8][9][10][11][12][13] over the last decade. The investigation of the coherent phenomena in quantum wires ͑QWR's͒ has recently become possible due to major improvements in patterning technology and growth techniques.…”

Dephasing in the quasi-two-dimensional exciton-biexciton system

“…6,15 The measured radiative lifetime of about 50 ps is in agreement with a bipolariton model suggested by Ivanov et al 16 The acousticphonon scattering was assigned to phonon absorption. In CdSe the induced exciton-biexciton transition was investigated by FWM, 5,17 showing a dephasing time of 20 ps and an acoustic-phonon scattering with an activation energy given by the biexciton binding energy. In quasi-two-dimensional GaAs structures, the giant oscillator strength model gives comparable radiative decay rates for excitons and biexcitons, 18,19 while the bipolariton model 20,21 predicts a fast decay of biexcitons into interface polaritons.…”