Evolution of Temporal Coherence in Confined Exciton-Polariton Condensates
Evolution of Temporal Coherence in Confined Exciton-Polariton Condensates
复制标题
DOI：
10.1103/physrevlett.120.017401
复制
发表时间：
2018-01-05
影响因子：
8.6
通讯作者：
Hoefling, S.
中科院分区：
文献类型：
--
作者：
Klaas, M.;Flayac, H.;Hoefling, S.
研究了强耦合条件下空间约束对半导体微重发射的二阶相干性的影响。蚀刻微柱提供的约束对器件中超过阈值的固态准凝聚态的时间相干性有有利的影响。通过将实验数据与基于量子跃迁方法的微观量子理论拟合，我们仔细研究了泵浦功率和约束的影响，并发现声子介导的跃迁在受限结构的情况下增强，其中模式分裂为离散集。通过将泵浦功率提高到冷凝阈值以上，在空间约束增加的器件中，时间相干性显著提高，正如发射光从热统计到相干统计的转变所揭示的那样。
We study the influence of spatial confinement on the second-order temporal coherence of the emission from a semiconductor mieroeavity in the strong coupling regime. The confinement, provided by etched micropillars, has a favorable impact on the temporal coherence of solid state quasicondensates that evolve in our device above threshold. By fitting the experimental data with a microscopic quantum theory based on a quantum jump approach, we scrutinize the influence of pump power and confinement and find that phonon-mediated transitions are enhanced in the case of a confined structure, in which the modes split into a discrete set. By increasing the pump power beyond the condensation threshold, temporal coherence significantly improves in devices with increased spatial confinement, as revealed in the transition from thermal to coherent statistics of the emitted light.