Exciton Polariton Lasing and Condensates in All-Inorganic Perovskite Microcavities

In the past decade, halide perovskites have shown tremendous promise in photovoltaics, light-emitting devices, miniaturized lasers and other diverse applications in optoelectronics. Perovskite semiconductors exhibit high optical gain properties, large oscillator strength, strong exciton binding energy and so forth, therefore they provide a unique platform to study strong light-matter coupling in microcavity devices. Here in this talk, I will present an overview of the historical development of exciton polariton research in halide perovskite materials. Particular focus will be given to the comparison between different optical gain materials and their advantages (and disadvantages); then I will discuss our recent progress in demonstration of room-temperature exciton polariton lasing and condensate in all-inorganic perovskite microcavities and their nonlinear optical properties, which drives the coherent propagation in condensate in waveguides for ultrafast optical switching applications. Finally, I will discuss the realization of artificial lattices towards quantum control of exciton polariton condensate at room temperature and their potential applications in 2D quantum simulators.<br/> <br/>References:<br/> <br/>R. Su&lt;span style="font-size:10.8333px"&gt; et al.&lt;/span&gt;, “Perovskite semiconductors for room-temperature exciton-polaritonics”, <b><i>Nature Materials</i></b>, DOI: 10.1038/s41563-021-01035-x (<b>perspective</b>) (2021)<br/>Q. Zhang et al., “Halide perovskite semiconductor lasers: materials, cavity design, and low threshold”, <b><i>Nano Lett</i></b><b>.</b> 21 DOI: 10.1021/acs.nanolett.0c03593 (2021) (<b>invited minireview</b>)<br/>R. Su et al., “Optical switching of topological phase in a perovskite polariton lattice”, <i>Science Advances</i> <b>7</b>, eabf8049 (2021)<br/>R. Su et al., “Observation of exciton polariton condensation in a perovskite lattice at room temperature”, <b><i>Nature Physics</i></b> <b>16</b>, 301-306 (2020)<br/>R. Su et al., “Room-temperature polariton lasing in all-inorganic perovskite nanoplatelets”, <i>Nano Lett.</i> <b>17</b>, 3982–3988 (2017)