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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2007

Measurement of exciton spin coherence by nondegenerate four-wave mixing experiments in the chi((3)) regime

Résumé

We demonstrate that the spin coherence relaxation of excitons can be measured in a three-beam four-wave mixing experiment in the chi((3)) regime, using a sequence of contracircularly polarized pulses. In contrast to other techniques like Faraday rotation measurement, our method allows one to access spin coherence without applying an external magnetic field. The superposition of opposite spin states (exciton-polariton spin coherence) is then probed in a nondegenerate configuration at the biexciton-exciton transition. Measurements are performed on a bulk CuCl platelet. The polariton effect is taken into account by modeling the propagation of the pulses. The exciton-polariton spin coherence time is demonstrated to be mainly determined by their spin lifetime.
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Dates et versions

hal-00545184 , version 1 (09-12-2010)

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P. Gilliot, Steeve Cronenberger, H. Rahimpour Soleimani, Christelle Brimont, O. Cregut, et al.. Measurement of exciton spin coherence by nondegenerate four-wave mixing experiments in the chi((3)) regime. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2007, 75, pp.125209. ⟨10.1103/PhysRevB.75.125209⟩. ⟨hal-00545184⟩

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