Exciton-polariton dynamics of the single site-controlled quantum dot-nanocavity in the coexisting strong-weak coupling regime
Exciton-polariton dynamics of the single site-controlled quantum dot-nanocavity in the coexisting strong-weak coupling regime
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DOI：
10.1088/1367-2630/acc26c
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发表时间：
2021-07
影响因子：
3.3
通讯作者：
Jiahui Huang;Wei Liu;M. Sarihan;Xiang Cheng;A. Miranda;B. Dwir;A. Rudra;E. Kapon;C. Wong
中科院分区：
文献类型：
--
作者：
Jiahui Huang;Wei Liu;M. Sarihan;Xiang Cheng;A. Miranda;B. Dwir;A. Rudra;E. Kapon;C. Wong
在（111）B取向的GaAs光子晶体腔中确定性定位纳米级精度的单点控制的高度对称InGaAs量子点（QD）为构建集成量子光子电路提供了一种理想的器件。然而，在这样的系统中改善腔Q因子一直是一个长期存在的挑战。在这里，通过优化腔损耗和QD光谱质量之间的权衡，我们证明了我们的站点控制的QD纳米腔系统在声子散射介导的中间耦合制度下运行，强耦合和弱耦合的动态共存。依赖于腔激子失谐的显微光致发光光谱揭示了激子-极化激元模式避免交叉的趋势，作为强耦合系统的Rabi双峰的签名。同时，耦合激子-腔模（CM）能量在零失谐范围内保持不变或轻微蓝移的趋势归因于声子辅助耦合介导的集体态的形成，而它们罕见的部分失步线宽变窄与它们共存的强弱耦合机制有关.我们进一步揭示了这种共存的强弱耦合系统的反聚束光子统计动力学和强限制激子-极化激元和暗激子类态的光学特性。这些观察结果表明，作为确定性量子节点的芯片上的量子信息处理的站点控制的量子点腔系统的潜在能力，并为未来的设备优化实现强耦合制度提供了指导方针。
Deterministic positioning single site-controlled high symmetric InGaAs quantum dots (QDs) in (111)B-oriented GaAs photonic crystal cavities with nanometer-scale accuracy provides an idea component for building integrated quantum photonic circuits. However, it has been a long-standing challenge of improving cavity Q-factors in such systems. Here, by optimizing the trade-off between the cavity loss and QD spectral quality, we demonstrate our site-controlled QD-nanocavity system operating in the intermediate coupling regime mediated by phonon scattering, with the dynamic coexistence of strong and weak coupling. The cavity-exciton detuning-dependent micro-photoluminescence spectrum reveals concurrence of a trend of exciton-polariton mode avoided crossing, as a signature of Rabi doublet of the strongly coupled system. Meanwhile, a trend of keeping constant or slight blue shift of coupled exciton–cavity mode(CM) energy across zero-detuning is ascribed to the formation of collective states mediated by phonon-assisted coupling, and their rare partial out-of-synchronization linewidth-narrowing is linked to their coexisting strong-weak coupling regime. We further reveal the pump power-dependent anti-bunching photon statistical dynamics of this coexisting strong-weak coupled system and the optical features of strongly confined exciton-polaritons, and dark-exciton-like states. These observations demonstrate the potential capabilities of site-controlled QD-cavity systems as deterministic quantum nodes for on-chip quantum information processing and provide guidelines for future device optimization for achieving the strong coupling regime.