Giant superfluorescent bursts from a semiconductor magneto-plasma
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Superradiance - the cooperative decay of excited dipoles - has recently been discussed in a diverse range of contexts in which coherent coupling of constituent particles governs their cooperative dynamics: cavity quantum electrodynamics, quantum phase transitions and plasmonics. Here we observe intense, delayed bursts of coherent radiation from a photo-excited semiconductor and interpret it as superfluorescence, where macroscopic coherence spontaneously appears from initially incoherent electron-hole pairs. The coherence then decays superradiantly, with a concomitant abrupt decrease in population from full inversion to zero. This is the first observation of superfluorescence in a dense semiconductor plasma, where decoherence is much faster than radiative decay, a situation never encountered in atomic cases. Nonetheless, a many-body cooperative state of phased electron-hole 'dipoles' does emerge at high magnetic fields and low temperatures, producing giant superfluorescent pulses. The solid-state realization of superfluorescence resulted in unprecedented controllability, promising tunable sources of coherent pulses. 2012 Macmillan Publishers Limited. All rights reserved.
Noe, G., Kim, J., Lee, J., Wang, Y., Wojcik, A. K., McGill, S. A., ... Kono, J.
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Noe, G Timothy II||Kim, Ji-Hee||Lee, Jinho||Wang, Yongrui||Wojcik, Aleksander K||McGill, Stephen A||Reitze, David H||Belyanin, Alexey A||Kono, Junichiro
