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The exciton binding energy in GaAs-based quantum-well (QW) structures is in the range of ~10 meV, which falls in the terahertz (THz) regime. THz-induced nonlinear optical effects of excitons in QWs are of great interest because they provide new insights into the quantum coherence and wavepacket dynamics in semiconductors. This paper presents a time-resolved study to observe resonant interactions of...
We demonstrate the ultrafast coherent dynamics of exciton wavepackets in semiconductor QWs resonantly driven by strong narrowband THz pulses. Time-resolved THz-pump and optical-probe measurements exhibit large-signal nonlinear optical transients of the HH and LH exciton lines in GaAs/AlGaAs QWs.
We report quantitative spectrally-resolved transient absorption in GaAs quantum wells for varying pump intensity. Comparison to microscopic modeling yields quantitative information about the Coulomb-induced nonlinearities and radiative coupling.
We investigate the coherent dynamics of excitonic wavepackets in semiconductors driven by intense narrowband THz pulses. Time-resolved THz-pump and optical-probe measurements demonstrate strong nonlinear-optical transients of the light-hole and heavy-hole excitonic resonances in GaAs/AlGaAs QWs.
We investigate coherent THz-induced dynamics for optical excitation in semiconductor quantum-wells via THz-pump and optical-probe experiments. Strong single-cycle THz pulses induce transient spectral-shifts and broadening of the light-hole and heavy-hole excitonic resonances in GaAs/AlGaAs quantum-wells.
An excitonic blue-shift is observed when a GaAs/AlGaAs superlattice is irradiated with a strong THz field. This observation is compared with a microscopic calculation, and is consistent with the onset of dynamical localization
Summary form only given. Recently a lot of interest has been focused on higher-order Coulomb correlations. It was shown, that even in the /spl chi//sup (3)/-limit higher-order excitonic correlations, i.e., bound and unbound two exciton states, influence the coherent optical response. While /spl chi//sup (3)/-contributions to the excitonic Stark effect are well understood, very little is known about...
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