Coherent excitonic effects in quantum wells

Coherent spin dynamics of an interwell excitonic gas in GaAs/AlGaAs coupled quantum wells

Excitonic Radiative Dynamics in Multiple Quantum Wells

The fundamental intrinsic radiative process associated with excitons in semiconductor multiple quantum wells is discussed within the context of exciton polaritons. Multiple quantum wells in which each well is randomly displaced from its ideal periodic position are discussed in order to investigate the effect of disorder on excitonic radiative widths. The coherent transpori of excitons in multip...

Time resolved excitonic coherent polarization dynamics in GaAs multiple quantum wells

We investigate pump induced modulation in the temporal evolution of the excitonic coherent polarization generated by a probe pulse in GaAs multiple quantum wells. For this, we perform fs time resolved pump-probe reflectivity measurements using frequency upconversion at both positive and negative pump-probe delays. A contribution arising from interference of excitonic linear and nonlinear polari...

Phase coherent photorefractivity in ZnSe single quantum wells.

We observe an efficient phase coherent photorefractive effect in ZnSe single quantum wells for ultrashort light pulses resonant to the excitonic transition. The effect is attributed to the formation of an electron grating in the quantum well induced by the interference of coherent excitons that preserve phase and polarization of the incident light fields. All characteristic features of the diff...

Excitonic field screening and bleaching in InGaN/GaN multiple quantum wells

Photoinduced carrier dynamics in a sequence of InGaN/GaN multiple quantum wells (MQWs) are studied by employing steady state and ultrafast spectroscopy at room temperature. Time-resolved photoluminescence (PL) measured short carrier lifetimes of ,140 ps at room temperature. Steady state differential transmission was used to measure the in-well field screening due to the photoinjected carriers. ...