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We use terahertz pulses to induce resonant transitions between the eigenstates of optically generated exciton populations in a high-quality semiconductor quantum well sample. Monitoring the excitonic photoluminescence, we observe transient quenching of the 1s exciton emission, which we attribute to the terahertz-induced 1s-to-2p excitation. Simultaneously,… (More)
Time and wavelength resolved spectroscopy requires optical sources emitting very short pulses and a fast detection mechanism capable of measuring the evolution of the output spectrum as a function of time. We use table-top Ti:sapphire lasers and a free-electron laser (FEL) emitting ps pulses as excitation sources and a streak camera coupled to a… (More)
We have measured time-resolved photoluminescence (TRPL) quenching in strained In 0.2 Ga 0.8 As quantum wells induced by intense free-electron laser-generated (FEL) terahertz (THz) radiation. A picosecond-pulse Ti:Sapphire laser was used to create photoluminescence (PL), which was then collected using a streak camera-monochromator assembly. By changing the… (More)
We discuss recent experimental and theoretical results that report on the observation of dipole-forbidden intra-exciton transitions in semiconductors via terahertz excitation. Additional manipulation capabilities are gained through the application of a magnetic field.