IPEQ, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, 1015 Lausanne, Switzerland.
Phys Rev Lett. 2009 Dec 18;103(25):256402. doi: 10.1103/PhysRevLett.103.256402. Epub 2009 Dec 15.
We report on time-resolved measurements of the first order spatial coherence in an exciton-polariton Bose-Einstein condensate. Long-range spatial coherence is found to set in right at the onset of stimulated scattering, on a picosecond time scale. The coherence reaches its maximum value after the population and decays slowly, staying up to a few hundred picoseconds. This behavior can be qualitatively reproduced, using a stochastic classical field model describing interaction between the polariton condensate and the exciton reservoir within a disordered potential.
我们报告了激子极化激元玻色-爱因斯坦凝聚体中一阶空间相干性的时间分辨测量结果。发现长程空间相干性在受激散射开始时就立即建立，时间尺度为皮秒量级。相干性在种群增加后达到最大值，并缓慢衰减，持续时间可达几百皮秒。使用描述无序势中极化激元凝聚体和激子库相互作用的随机经典场模型，可以定性地再现这种行为。
