Monolayer transition metal dichalcogenides (TMD) with confined 2D Wannier-Mott excitons are intriguing for the fundamental study of strong light-matter interactions and the applications of exciton-polaritons based devices at high temperatures. However, the research of 2D exciton-polaritons has been hindered, because the polaritons in these atomically thin semiconductors discovered so far can hardly support strong nonlinear interactions and quantum coherence due to uncontrollable polariton dynamics and weakened coherent coupling. In this work, we demonstrate, for the first time, precisely controlled hybrid composition with angular dependence and dispersion-correlated polariton emission by tuning the polariton dispersion in TMD over a broad temperature range of 110-230 K in a single cavity. This tamed polariton emission is achieved by the realization of robust coherent exciton-photon coupling in a monolayer tungsten disulphide (WS2) with large splitting-to-linewidth ratios (SLR, >3.3). The unprecedented ability to manipulate the dispersion and correlated properties of TMD exciton-polariton at will offers new possibilities to explore important quantum phenomena such as Bose–Einstein condensation (BEC) and superfluidity, but also holds great promise to applications for the inversionless lasers and valleytronic devices.
Xiaoze Liu, Wei Bao, Quanwei Li, Chad Ropp, Yuan Wang, and Xiang Zhang, "Control of coherently-coupled exciton-polaritons in monolayer tungsten disulphide (Conference Presentation)," Proc. SPIE 10534, 2D Photonic Materials and Devices, 105340O (Presented at SPIE OPTO: January 30, 2018; Published: 14 March 2018); https://doi.org/10.1117/12.2297582.5751542897001.
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