Abstract
We have investigated the ultrafast carrier dynamics in high-optical-quality V-grooved GaAs/AlGaAs quantum wires using pump-probe spectroscopy. It is found that, with resonant excitation, a blue shift due to exciton–exciton interaction occurs within 0.3 ps followed by a redshift due to exciton relaxation. Under nonresonant excitation, the redshift occurs due to the phonon emission during exciton formation. As a result, the exciton formation time and the exciton lifetime in the quantum wires are found to be 5 and 110 ps, respectively. This exciton lifetime corresponds to the free-exciton lifetime close to the theoretical intrinsic lifetime of one-dimensional excitons and proves that our quantum wires have little interface disorder and have high optical quality.
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