Su Rui, Wang Jun, Zhao Jiaxin, Xing Jun, Zhao Weijie, Diederichs Carole, Liew Timothy C H, Xiong Qihua
Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.
MajuLab, CNRS-UNS-SU-NUS-NTU International Joint Research Unit, UMI 3654, Singapore, Singapore.
Sci Adv. 2018 Oct 26;4(10):eaau0244. doi: 10.1126/sciadv.aau0244. eCollection 2018 Oct.
Novel technological applications significantly favor alternatives to electrons toward constructing low power-consuming, high-speed all-optical integrated optoelectronic devices. Polariton condensates, exhibiting high-speed coherent propagation and spin-based behavior, attract considerable interest for implementing the basic elements of integrated optoelectronic devices: switching, transport, and logic. However, the implementation of this coherent polariton condensate flow is typically limited to cryogenic temperatures, constrained by small exciton binding energy in most semiconductor microcavities. Here, we demonstrate the capability of long-range nonresonantly excited polariton condensate flow at room temperature in a one-dimensional all-inorganic cesium lead bromide (CsPbBr) perovskite microwire microcavity. The polariton condensate exhibits high-speed propagation over macroscopic distances of 60 μm while still preserving the long-range off-diagonal order. Our findings pave the way for using coherent polariton condensate flow for all-optical integrated logic circuits and polaritonic devices operating at room temperature.
新型技术应用极大地推动了采用非电子替代方案来构建低功耗、高速全光集成光电器件。极化激元凝聚体具有高速相干传播和基于自旋的行为，对于实现集成光电器件的基本元件（开关、传输和逻辑）具有相当大的吸引力。然而，这种相干极化激元凝聚体流的实现通常限于低温，这受到大多数半导体微腔中激子结合能小的限制。在此，我们展示了在一维全无机溴化铯铅（CsPbBr）钙钛矿微线微腔中，室温下远程非共振激发极化激元凝聚体流的能力。该极化激元凝聚体在60μm的宏观距离上呈现高速传播，同时仍保持长程非对角有序。我们的研究结果为在室温下运行的全光集成逻辑电路和极化激元器件使用相干极化激元凝聚体流铺平了道路。
