Physics – Optics
Scientific paper
2011-07-26
Phys. Rev. B 84, 115206 (2011)
Physics
Optics
8 pages, 3 figures, submitted to PRB
Scientific paper
10.1103/PhysRevB.84.115206
Superfluorescence (SF) is the emission from a dense coherent system in population inversion, formed from an initially incoherent ensemble. This is characterised by an induction time (t_D) for the spontaneous development of the macroscopic quantum coherence. Here we report detailed observation of SF on ultrafast timescale from a quantum ensemble of coherent excitons in highly excited intrinsic bulk ZnTe single crystal at 5 K, showing a characteristic t_D from 40 ps to 10 ps, quantum noise and fluctuations, and quantum beating and ringing. From this clear observation of SF from a spontaneous coherence of excitons we infer that this is indicative of the formation of BEC of excitons on an ultrafast timescale.
Dai De-Chang
Monkman A. P.
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