莫尔激子-极化激元的电荷可调光学非线性
Charge Tunable Optical Nonlinearity of Moiré Exciton-Polaritons
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中文总结 AI 辅助
本研究以过渡金属二硫化物为平台，通过电荷掺杂调控莫尔激子-极化激元的光学非线性，利用栅极可控异质双层实现强耦合，小电压可将饱和所需极化激元密度降一个数量级，其微观模型能解释观测现象。
中文摘要 AI 辅助
过渡金属二硫化物是研究有序晶格中激子与电子间强光-物质相互作用的通用平台。莫尔结构的扭转工程可通过纳米尺度调控激子分布来操控极化激元非线性。本研究中，我们通过电荷掺杂实现相空间限制，展示了对莫尔激子-极化激元基于光学饱和的非线性的原位调控。在嵌入光谱可调开放腔的栅极可控MoTe₂-MoSe₂异质双层中，建立了强激子-光子耦合；小栅极电压可将达到类似电荷中性情况下非线性饱和效应所需的极化激元密度降低一个数量级。我们的微观描述在具有电荷预占据的莫尔超晶格的泡利阻塞框架下，成功解释了观测到的现象。
英文摘要
Transition metal dichalcogenides represent a versatile platform to study strong light-matter interactions based on excitons and electrons in ordered lattices. Twist-engineering of moiré structures further enables the manipulation of the polaritonic nonlinearities via engineering the exciton landscape on the nanoscale. In this work, we demonstrate in-situ control of the optical saturation-based nonlinearity of moiré exciton-polaritons by phase space restriction via charge doping. Strong exciton-photon coupling is established in a gate-controllable MoTe$_2$-MoSe$_2$ heterobilayer, embedded in a spectrally-tunable open cavity. A small gate voltage can effectively lower the necessary polariton density by one order of magnitude to achieve a similar nonlinear saturation effect as in the charge-neutral case. Our microscopic description successfully explains the observed phenomena in the framework of Pauli blocking for the moiré superlattices with charge preoccupation.
