Polaritonic Stop-Band Transparency via Exciton-Biexciton Coupling in CuCl

Abstract : Radiation is almost completely reflected within the exciton-polariton stop band of a semiconductor, as in the typical case of CuCl. We predict, however, that a coherently driven exciton-biexciton transition allows for the propagation of a probe light beam within the stop band. The phenomenon is reminiscent of electromagnetically induced transparency effects occurring in three-level atomic systems, except that it here involves delocalized electronic excitations in a crystalline structure via a frequency and wave-vector selective polaritonic mechanism. A well-developed transparency, favored by the narrow linewidth of the biexciton, is established within the stop band where a probe pulse may propagate with significant delays. The transparency window can be controlled via the pump beam detuning and intensity.
keyword : exciton
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Submitted on : Saturday, March 13, 2010 - 9:21:39 PM
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S. Chesi, M. Artoni, G. La Rocca, F. Bassani, André Mysyrowicz. Polaritonic Stop-Band Transparency via Exciton-Biexciton Coupling in CuCl. Physical Review Letters, American Physical Society, 2003, 91 (5), pp.057402. ⟨10.1103/PhysRevLett.91.057402⟩. ⟨hal-00463647⟩

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