Superfluorescence from magnetically formed quantum dots: the excitation pulse-width dependence
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We investigated the laser pulse-width dependence of dense plasmas confined within the magnetic length of In0.2Ga0.8As/GaAs multiple quantum wells under high magnetic fields up to 31 T. To fully fill the Landau levels of effectively zero-dimensional system, we used intense femtosecond (fs) laser pulses to create carrier densities near 1013/cm2. The observed photoluminescence showed a characteristic of superfluorescence, above critical magnetic field when being excited by pulses shorter than coherence buildup time.