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arXiv 2406.08263cond-mat.mes-hall
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过渡金属二硫属化物双层中莫尔激子极化子的电可调谐增强非线性

Electrically tunable and enhanced nonlinearity of moiré exciton-polaritons in transition metal dichalcogenide bilayers

Kok Wee Song, Oleksandr Kyriienko

AI总结:

本文建立了TMD双层中莫尔激子极化子非线性光学响应的微观理论,揭示了由各向异性库仑相互作用和Umklapp散射引起的增强非线性,并证明可通过外加电场将吸引型非线性调控为排斥型,为非线性极化子器件提供了可控平台。

摘要:

我们为过渡金属二硫属化物(TMDs)双层中的莫尔激子极化子的非线性光学响应建立了微观理论。该理论允许在广泛的扭转角($θ$)、外加电场和光-物质耦合范围内研究隧穿耦合的层内和层间激子模式,从而提供了对先前无法实现的杂化区域的深入理解。具体而言,我们考虑了导致非线性增强的两个激子极化子的Umklapp散射过程,并表明这对于描述强杂化下的相互作用至关重要。我们揭示了莫尔极化子的一种吸引型非线性区域,它源于各向异性库仑相互作用,能够解释TMD双层中光学响应的某些实验特征。此外,我们的理论证明,通过施加外加电场可将该吸引型非线性调节为排斥型。研究结果表明,非线性莫尔极化子为非线性极化子器件提供了可控平台。

英文摘要:

We develop a microscopic theory for nonlinear optical response of moiré exciton-polaritons in bilayers of transition metal dichalcogenides (TMDs). Our theory allows to study the tunnel-coupled intralayer and interlayer excitonic modes for a wide range of twist angles ($θ$), external electric field, and light-matter coupling, providing insights into the hybridization regime inaccessible before. Specifically, we account for the Umklapp scattering processes of two exciton-polaritons responsible for enhanced nonlinearity, and show that it is crucial for describing interactions at strong hybridization. We reveal a regime of attractive nonlinearity for moiré polaritons, stemming from the anisotropic Coulomb interactions, which can explain some of experimental features of optical response in TMD bilayers. Furthermore, within our theory we demonstrate that the attractive nonlinearity can be tuned into repulsive by applying an external electric field. Our findings show that nonlinear moiré polaritons offer a controllable platform nonlinear polaritonic devices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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