Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2006-07-02
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
8 pages, 6 figures, to be submitted to PRB
Scientific paper
Cooperative spontaneous recombination (superfluorescence) of electron-hole plasmas in semiconductors has been a challenge to observe due to ultrafast decoherence. We argue that superfluorescence can be achieved in quantum-confined semiconductor systems and present experimental evidence for superfluorescence from high-density photoexcited electron-hole plasmas in quantum wells under high magnetic fields (> 20 T). At a critical magnetic field strength and excitation fluence, we observe a clear transition in the band-edge photoluminescence from omnidirectional output to a randomly directed but highly collimated beam. Changes in the linewidth, carrier density, and magnetic field scaling of the emission spectra correlate precisely with the onset of random directionality and are consistent with cooperative recombination. We further investigate the effects of spot size, temperature, and excitation geometry on the emission properties.
Belyanin Alexey
Jho Y.-D.
Kocharovsky Vitaly V.
Kocharovsky Vl. V.
Kono Junichiro
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