A predicted "Faraday oscillation" in photoexcited semiconductors

Details A predicted "Faraday oscillation" in photoexcited semiconductors A predicted "Faraday oscillation" in photoexcited semiconductors

2008-02-04

arxiv.org/abs/0802.0435v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

While, for semiconductors photoexcited by a circularly polarized pump, the polarization plane of a linearly polarized probe has been shown to rotate, we here predict a spectacular change when the pump beam is linearly polarized, from Faraday rotation to Faraday oscillation, the oscillation of the polarization plane going along a change of the photon polarization from linear to elliptical. This effect, which reduces to zero when the probe field is parallel or perpendicular to the pump field, comes from coherence between the real excitons created by the pump and the virtual exciton coupled to the unabsorbed probe, as easy to see from the Shiva diagrams which represent the many-body physics taking place in this coupled photon-composite-exciton system.

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