Tunable Valley Polarized Plasmon-Exciton Polaritons in Two-Dimensional Semiconductors,ACS Nano

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Tunable Valley Polarized Plasmon-Exciton Polaritons in Two-Dimensional Semiconductors
ACS Nano ( IF 15.8 ) Pub Date : 2019-02-06 00:00:00 , DOI: 10.1021/acsnano.8b06775
Boyang Ding ₁ , Zhepeng Zhang ₂ , Yu-Hui Chen ₃ , Yanfeng Zhang ₂ , Richard J. Blaikie ₁ , Min Qiu _{4,

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Affiliation

Monolayers of transition-metal dicalcogenides have emerged as two-dimensional semiconductors with direct bandgaps at degenerate but inequivalent electronic “valleys”, supporting distinct excitons that can be selectively excited by polarized light. These valley-addressable excitons, when strongly coupled with optical resonances, lead to the formation of half-light half-matter quasiparticles, known as polaritons. Here we report self-assembled plasmonic crystals that support tungsten disulfide monolayers, in which the strong coupling of semiconductor excitons and plasmon lattice modes results in a Rabi splitting of ∼160 meV in transmission spectra as well as valley-polarized photoluminescence at room temperature. More importantly we find that one can flexibly tune the degree of valley polarization by changing either the emission angle or the excitation angle of the pump beam. Our results provide a platform that allows the detection, control, and processing of optical spin and valley information at the nanoscale under ambient conditions.

中文翻译：

二维半导体中的可调谷极化等离子激子极化子

过渡金属双钙化物的单分子层已成为二维半导体，在简并但不等价的电子“谷”处具有直接带隙，支持能被偏振光选择性激发的独特激子。这些谷底可激子在与光共振强烈耦合时会导致形成半光半物质准粒子，即极化子。在这里，我们报告了支持二硫化钨单层的自组装等离子体激元晶体，其中半导体激子和等离子体激元晶格模式的强耦合导致透射光谱中的〜160 meV的拉比分裂以及室温下的谷极化光致发光。更重要的是，我们发现可以通过改变泵浦光束的发射角或激发角来灵活地调整谷底偏振度。我们的结果提供了一个平台，可以在环境条件下检测，控制和处理纳米级的光学自旋和谷值信息。

更新日期：2019-02-06

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