双光子泵浦极化激元凝聚体中暗激子诱导玻色子激发的时间特征
Temporal Signature of Bosonic Stimulation Induced by Dark Exciton in a Two-photon Pumped Polariton Condensate
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中文总结 AI 辅助
该研究通过时间分辨光致发光光谱，揭示双光子泵浦极化激元凝聚体中暗激子诱导玻色子激发的时间特征，发现两种泵浦机制下的速率差异，为高效太赫兹激光提供新通道。
中文摘要 AI 辅助
强耦合光物质激子极化激元构成一种片上固态平台，在此平台上，宏观量子凝聚现象不仅可在较高温度下实现，还能通过光学方式调控，包括其与不可达的“暗”态的相互作用。近期一项研究表明，在非线性双光子泵浦下可建立极化激元凝聚，为暗态-凝聚体相干调控及高效太赫兹（THz）激光开辟了道路。本文中，我们首次通过时间分辨光致发光光谱研究单光子与双光子泵浦下的凝聚，揭示了暗激子诱导玻色子激发的时间特征。结果显示，单光子与双光子泵浦下，凝聚体诱导蓝移的建立速率和弛豫速率对失谐的依赖存在显著差异。该差异与两种泵浦机制中激子占比的依赖强度相关：单光子泵浦下以极化激元-极化激元激发为主，而双光子泵浦下，2p激子到低极化激元的太赫兹跃迁可与多种自旋翻转、电子-空穴交换及声子相关机制共同构成另一激发通道。这些观测结果表明存在一种新型暗态起源的激发通道，有望促进半导体微腔中高效太赫兹激光的实现。
英文摘要
Strongly-coupled light-matter exciton-polaritons constitute an on-chip solid-state platform where the macroscopic quantum phenomenon of condensation is not only achievable at elevated temperatures, but can also be optically controlled, including through their interaction with inaccessible "dark" states. A recent study has shown that polariton condensation can be established under nonlinear two-photon pumping, paving the way towards dark state-condensate coherent control and highly-efficient terahertz (THz) lasing. In this letter, we show for the first time a temporal signature of dark exciton induced bosonic stimulation by investigating one- and two-photon pumped condensation with time-resolved photoluminescence spectroscopy. Our results show a clear difference in the detuning dependence of the buildup and relaxation rates of the condensate-induced blueshifts under one- and two-photon pumping. This difference is associated with the stronger exciton-fraction dependence expected for one-photon pumped condensation, where polariton-polariton stimulation dominates, compared with two-photon pumped condensation, where a 2p-exciton-to-lower-polariton THz transition can provide another stimulation channel, together with various spin-flip, electron-hole exchange and phonon-based mechanisms. These observations indicate the presence of a new dark state originated stimulation channel that could facilitate highly-efficient THz lasing in semiconductor microcavities.
发表机构
- Technion – Israel Institute of Technology（以色列理工学院）
- Universität Würzburg（维尔茨堡大学）
- Carl von Ossietzky Universität Oldenburg（奥尔登堡卡尔·冯·奥西茨基大学）
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