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Signatures of stimulated bosonic exciton-scattering in semiconductor luminescence

机译:半导体发光中受激玻色子激子散射的特征

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We observe signatures of stimulated bosonic scattering of excitons, a precursor of Bose-Einstein-Condensation (BEC), in the photoluminescence of semiconductor quantum wells. The optical decay of a spinless molecule of two excitons (biexciton) into an exciton and a photon with opposite angular momenta is subject to bosonic enhancement in the presence of other excitons. In a gas of biexcitons and spin polarized excitons the bosonic enhancement breaks the symmetry of two equivalent biexciton decay channels leading to circularly polarized luminescence of the biexciton with the sign opposite to the circularly polarized exciton luminescence. Comparison of experiment and many body theory clearly indicates the existence of stimulated exciton scattering, but excludes the presence of a fully condensed BEC-like state. (c) 2005 Elsevier Ltd. All rights reserved.
机译:我们在半导体量子阱的光致发光中观察到激子的激子玻色子散射的特征,激子是玻色-爱因斯坦凝聚(BEC)的前体。在存在其他激子的情况下,两个激子的无旋转分子(比西顿)的光衰变为激子和具有相反角动量的光子会发生玻色子增强。在双激子和自旋极化激子的气体中,玻色增强增强了两个等效双激子衰变通道的对称性,导致双激子的圆极化发光,其符号与圆极化激子发光相反。实验与许多人体理论的比较清楚地表明存在受激激子散射,但排除了完全凝聚的BEC样状态的存在。 (c)2005 Elsevier Ltd.保留所有权利。

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