Room temperature polariton lasing in quantum heterostructure nanocavities
Room temperature polariton lasing in quantum heterostructure nanocavities
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DOI：
10.1126/sciadv.aau9338
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发表时间：
2019-04-01
期刊：
影响因子：
13.6
通讯作者：
Cho, Chang-Hee
中科院分区：
文献类型：
--
作者：
Kang, Jang-Won;Song, Bokyung;Cho, Chang-Hee
超低阈值相干光发射器可以通过激子-极化激元凝聚体的激光来实现，但这通常需要复杂的器件结构和低温。在室温下工作的极化激元纳米激光器是相关研究的关键路径，不仅用于探索纳米尺度下的极化激元物理，而且在量子信息系统、全光逻辑门和超低阈值激光器中具有潜在的应用。然而，目前，室温极化激元纳米激光器的进展受到激子的热不稳定性和纳米腔固有的低品质因数的限制。在这里，我们展示了室温极化激元纳米激光器，通过设计宽禁带半导体异质结构纳米腔产生热稳定的激子与纳米腔光子耦合。由此产生的激子极化激元的拉比频率约为370毫电子伏的混合状态，使持久的极化激元激光到室温，有利于实现小型化和集成的极化激元系统。
Ultralow-threshold coherent light emitters can be achieved through lasing from exciton-polariton condensates, but this generally requires sophisticated device structures and cryogenic temperatures. Polaritonic nanolasers operating at room temperature lie on the crucial path of related research, not only for the exploration of polariton physics at the nanoscale but also for potential applications in quantum information systems, all-optical logic gates, and ultralow-threshold lasers. However, at present, progress toward room temperature polariton nanolasers has been limited by the thermal instability of excitons and the inherently low quality factors of nanocavities. Here, we demonstrate room temperature polaritonic nanolasers by designing wide-gap semiconductor heterostructure nanocavities to produce thermally stable excitons coupled with nanocavity photons. The resulting mixed states of exciton polaritons with Rabi frequencies of approximately 370 meV enable persistent polariton lasing up to room temperature, facilitating the realization of miniaturized and integrated polariton systems.