Ultralow Threshold Room Temperature Polariton Condensation in Colloidal CdSe/CdS Core/Shell Nanoplatelets.
Ultralow Threshold Room Temperature Polariton Condensation in Colloidal CdSe/CdS Core/Shell Nanoplatelets.
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DOI：
10.1002/advs.202200395
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发表时间：
2022-06
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室温激子-极化子玻色-爱因斯坦凝聚（BEC）是一种强非线性的单量子态相变，为相干光源和超低阈值光开关提供了一种新的策略。在这项工作中，胶体CdSe/CdS 2D纳米片被嵌入到微腔中，并且在室温下以0.5 μJ cm-2的超低阈值实现激子极化子BEC。超线性功率相关发射、基态的宏观占据、发射峰的强蓝移和加宽以及长程相干性强烈地证实了极化激元激光器的实现。这项工作表明胶体纳米片在低成本，高性能极化激元器件和相干光源中具有相当大的前景。首次在胶体CdSe/CdS纳米片体系中实现了室温极化激元玻色-爱因斯坦凝聚，其超低阈值为0.5 μJ cm−2。自发的长距离空间和时间相干性的建立表明了相干光源的新策略。此外，本工作也为超低阈值量子器件的研究提供了一个新的物理平台。
Room‐temperature exciton‐polariton Bose‐Einstein condensation (BEC), a phase transition to single quantum state with strong nonlinearity, provides a new strategy for coherent light sources and ultralow threshold optic switches. In this work, colloidal CdSe/CdS 2D nanoplatelets are embedded into a microcavity, and exciton‐polariton BEC is realized with an ultralow threshold of 0.5 µJ cm–2 at room temperature. The superlinear power‐dependent emission, macroscopic occupation of the ground state, strong blueshift and broadening of the emission peak, and long‐range coherence strongly confirm the realization of the polariton laser. This work suggests considerable prospects for colloidal nanoplatelets in low‐cost, high‐performance polariton devices, and coherent light sources. Room temperature polariton Bose–Einstein condensation is realized for the first time in colloidal CdSe/CdS nanoplatelet system with an ultralow threshold of 0.5 μJ cm−2. The build‐up of spontaneous long‐range spatial and temporal coherence indicates a new strategy for coherent light sources. In addition, this work also provides a new physical platform for the ultralow threshold quantum devices.