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Coherent dynamics of bipolaritons in bulk CdS

Mann, Ch., Langbein, Wolfgang Werner, Woggon, U. and Ivanov, A. 2001. Coherent dynamics of bipolaritons in bulk CdS. Physical Review B 64 (23) , 235206. 10.1103/PhysRevB.64.235206

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The coherent dynamics of an optically driven exciton–photon–bipolariton system is studied in bulk CdS. Applying backward-scattering four-wave mixing (FWM) spectroscopy, we analyze the two-photon polarization associated with excitonic molecules and determine the dephasing time T2≃4.8 ps. We demonstrate that the molecule-mediated FWM signal persists at positive time delays even in the χ(3) limit, due to the spatial pinning of coherent polaritons induced by the second pulse. By generalizing the bipolariton model to uniaxial semiconductors, we calculate τXXrad≃2.8 ps, justify the T2=2T1 limit, and prove the bipolariton representation for excitonic molecules in CdS.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: American Physical Society
ISSN: 0163-1829
Last Modified: 04 Jun 2017 08:00

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