Strong light-matter coupling in two-dimensional atomic crystals
Strong light-matter coupling in two-dimensional atomic crystals
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DOI：
10.1038/nphoton.2014.304
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发表时间：
2015-01-01
期刊：
影响因子：
35
通讯作者：
Menon, Vinod M.
中科院分区：
文献类型：
--
作者：
Liu, Xiaoze;Galfsky, Tal;Menon, Vinod M.
石墨烯的二维原子晶体，以及过渡金属二卤化物，已经成为一类表现出与光强烈相互作用的材料。这种相互作用可以通过将这种材料嵌入光学微腔来进一步控制。当相互作用的速率被设计得比光和物质实体的耗散更快时，一个人就达到了“强耦合”状态。这导致了被称为微腔极化子的半光、半物质玻色子准粒子的形成。在这里，我们报道了在室温下，在介电微腔内嵌入的二硫化钼(MoS_2)二维原子晶体中，存在着强烈的光-物质耦合和微腔极化电子形成的证据。由于二维激子与腔光子的耦合，在角分辨反射率和光致发光光谱中观察到46+/-3 meV的Rabi分裂。在室温下实现二维材料的强耦合，为开发实用的极化电子器件提供了一条诱人的途径。
Two-dimensional atomic crystals of graphene, as well as transition-metal dichalcogenides, have emerged as a class of materials that demonstrate strong interaction with light. This interaction can be further controlled by embedding such materials into optical microcavities. When the interaction rate is engineered to be faster than dissipation from the light and matter entities, one reaches the 'strong coupling' regime. This results in the formation of half-light, half-matter bosonic quasiparticles called microcavity polaritons. Here, we report evidence of strong light-matter coupling and the formation of microcavity polaritons in a two-dimensional atomic crystal of molybdenum disulphide (MoS2) embedded inside a dielectric microcavity at room temperature. A Rabi splitting of 46 +/- 3 meV is observed in angle-resolved reflectivity and photoluminescence spectra due to coupling between the two-dimensional excitons and the cavity photons. Realizing strong coupling at room temperature in two-dimensional materials that offer a disorder-free potential landscape provides an attractive route for the development of practical polaritonic devices.