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Resonant two-photon excitation of 1s paraexcitons in cuprous oxide

机译:氧化亚铜中1s对激子的共振双光子激发

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We have created paraexcitons in Cu2O via resonant two-photon generation, and examined their population dynamics by means of time-correlated single photon detection. Confining the excitons to a constant volume in a harmonic-potential trap made with inhomogeneous applied stress along the [001] axis, we find that paraexcitons are created directly, and orthoexcitons appear primarily through a up-conversion of the paraexcitons. Also we generate excitons with two colliding pulses, and the luminescence is weaker than that from one beam excitation with same total laser power. These results show that resonant one-beam two-photon generation of paraexcitons is a promising way to pursue Bose-Einstein condensation of paraexcitons. (c) 2005 Elsevier Ltd. All rights reserved.
机译:我们通过共振双光子生成在Cu2O中创建了对激子,并通过与时间相关的单光子检测来检查了它们的种群动态。将激子限制在沿[001]轴施加不均匀应力的谐波势阱中的恒定体积内,我们发现直接产生了对激子,而正激子主要是通过对激子的上转换而出现的。同样,我们产生具有两个碰撞脉冲的激子,并且其发光强度比具有相同总激光功率的一束激发的发光强度要弱。这些结果表明,共振一束双光子产生的超激子是追求玻色-爱因斯坦对超激子凝聚的一种有前途的方法。 (c)2005 Elsevier Ltd.保留所有权利。

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