Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2002-07-02
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
8 pages, 3 eps figures, RevTeX, Physical Review Letters (accepted)
Scientific paper
10.1103/PhysRevLett.89.077402
The degree of circular polarization ($\wp$) of the non-linear emission in semiconductor microcavities is controlled by changing the exciton-cavity detuning. The polariton relaxation towards \textbf{K} $\sim 0$ cavity-like states is governed by final-state stimulated scattering. The helicity of the emission is selected due to the lifting of the degeneracy of the $\pm 1$ spin levels at \textbf{K} $\sim 0$. At short times after a pulsed excitation $\wp$ reaches very large values, either positive or negative, as a result of stimulated scattering to the spin level of lowest energy ($+1/-1$ spin for positive/negative detuning).
Aichmayr G.
Andre Régis
Martin Daniel M.
Vina L.
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