Quantum Statistics and Kinetics of Excitons

低温下半导体晶体的光激发 产生移动的电子和空穴，它们联合收割机形成短路 活激子由于它们的质量轻，激子 玻色-爱因斯坦效应的候选者 冷凝（BEC）。在强脉冲激光激发下， 温度、高纯度Cu 2 O单晶中的激子显示 量子统计特性导致BEC。的 目前的研究将创建和探索这个不寻常的系统， 检查弛豫动力学并尝试产生BEC。到 将通过施加应力来优化观察条件， 磁场对晶体的影响应变约束和亚开尔文 温度将用于产生长寿命的量子激子气体 并允许观察弹道传播的可能性， 宏观距离上的激子

Optical excitation of a semiconductor crystal at low temperature produces mobile electrons and holes which combine to form short lived excitons. Because of their light mass, excitons are candidates for a novel quantum effect called Bose-Einstein Condensation (BEC). Under intense pulsed laser excitation at low temperature, excitons in high-purity single crystals of CU2O display properties characteristic of quantum statistics leading to BEC. The present studies will create and probe this unusual system to examine the relaxation kinetics and to attempt to produce BEC. To conditions for observation will be optimized by applying stress and magnetic fields to the crystal. Strain-confinement and sub-Kelvin temperature will be used to produce long-lived quantum exciton gas and allow the possibility of observing ballistic propagation of excitons over macroscopic distances.