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Transient optical response of quantum well excitons to intense narrowband terahertz pulses
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View: Figures


Image of FIG. 1.
FIG. 1.

Schematic diagram of the exciton Rabi splitting. Optically excited -exciton polarization is resonantly driven by a THz pulse tuned to -to- transition.

Image of FIG. 2.
FIG. 2.

(a) Schematics of the THz-pump and optical-probe experiment. (b) Waveform of the THz radiation at 1.86 THz and (c) its power spectrum. The THz field amplitude is . (d) Modulated optical transmission spectrum (thick solid line) of HH and LH exciton resonances at 5 K when the GaAs/AlGaAs QW system is driven by strong narrowband THz pulses for the pump-probe delay time, . The arrows indicate the splitting of the HH exciton line. The thin gray line represents the unperturbed spectrum.

Image of FIG. 3.
FIG. 3.

spectra of the exciton lines at different THz frequencies, (a) 1.45, (b) 1.68, and (c) 2.15 THz. The time delay is 0.0 ps. The peak THz field amplitudes are at 1.45 and 1.68 THz and at 2.15 THz. spectra without the THz pulses are shown with shaded area. The insets show the power spectra of the THz radiation. Here, the vertical line indicates the -to- HH transition exciton frequency.

Image of FIG. 4.
FIG. 4.

Theoretical spectra corresponding to the experimental spectra in Fig. 3. In the computations, the exact experimental pulses at THz frequencies (a) 1.45, (b) 1.68, and (c) 2.15 THz were used and the delay time chosen as . The full computation (solid line) is compared to a computation where the -dephasing is artificially reduced (dashed line).


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Scitation: Transient optical response of quantum well excitons to intense narrowband terahertz pulses