Spintronique (multi-base)

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Detuning dependence of polariton spin dynamics

Identifieur interne : 004C24 ( Main/Exploration ); précédent : 004C23; suivant : 004C25

Detuning dependence of polariton spin dynamics

Auteurs : M D Martn [Espagne] ; G. Aichmayr [Espagne] ; L. Via [Espagne] ; R. Andr [France]

Source :

Abstract

We have investigated the polariton recombination and spin dynamics in the nonlinear emission regime as a function of the cavityexciton detuning (). The relaxation to K 0 states, after non-resonant excitation, is governed by polariton final-state stimulated scattering. The time evolution of the degree of polarization of the photoluminescence () shows a very rich and novel behaviour, never observed in the excitonic emission in bare quantum wells. attains its maximum at a finite time after the excitation with a light pulse instead of monotonically decaying to zero as in the case of bare excitons. Furthermore, the sign of is strongly dependent on the detuning: it is positive for > 0 and negative for < 0, showing an oscillatory behaviour for 0. The change in the sign of with the detuning is correlated with an energy splitting between the - and -polarized components of the photoluminescence.


Url:
DOI: 10.1088/0268-1242/19/4/120


Affiliations:


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