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Summary form only given. We report on our study of the carrier dynamics in InGaN/GaN MQWs by using femtosecond pump-probe transmission measurements. Our study indicates the existence of a strong barrier field, which is in balance with the strong piezoelectric field within the QWs. After photocarriers have been excited by optical pulses, the thermionically emitted electrons and holes were found to...
Summary form only given. Femtosecond intersubband spectroscopy provides fundamental insights into the ultrafast nonequilibrium processes of single-component, quasi-two-dimensional carrier plasmas. The time scales of intersubband scattering, thermalization and cooling are essential for understanding the relevant scattering processes and for designing novel infrared devices such as the quantum cascade...
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