Selectively Depopulating Valley-Polarized Excitons in Monolayer MoS2 by Local Chirality in Single Plasmonic Nanocavity.,Nano Letters

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Selectively Depopulating Valley-Polarized Excitons in Monolayer MoS2 by Local Chirality in Single Plasmonic Nanocavity.
Nano Letters ( IF 9.6 ) Pub Date : 2020-06-24 , DOI: 10.1021/acs.nanolett.0c01019
Jiawei Sun ₁ , Huatian Hu ₁ , Deng Pan ₂ , Shunping Zhang ₃ , Hongxing Xu _{1,

3}

Affiliation

Transition metal dichalcogenides, whose valley degrees of freedom are characterized by the degree of circular polarization (DCP) of the photoluminescence, draw broad interests due to their potential applications in information storage and processing. However, this DCP is usually low at room temperature due to the phonon-assisted intervalley scattering, severely degrading the fidelity of the valley-stored signals. Therefore, achieving high DCP at room temperature is vital for valley-encoded nanophotonic devices. In this work, we demonstrate a high DCP of 48.7% at room temperature by embedding monolayer MoS₂ into a compact plasmonic nanocavity. Such a high DCP is proven to originate from the prominent chiral Purcell effect owing to the degeneracy-lifted circularly polarized local density of states in the nanocavity. In addition, the DCP can be further manipulated by an in situ plasmon-scanned technique. This highly compact system provides possibilities for developing versatile valley-encoded light-emitting devices at room temperature.

中文翻译：

在单等离子纳米腔中通过局部手性选择性地减少单层MoS2中的谷极化激子。

过渡金属二卤化物的谷自由度以光致发光的圆偏振度（DCP）为特征，由于其在信息存储和处理中的潜在应用，引起了广泛的关注。然而，由于声子辅助的间隔扩散，该DCP在室温下通常较低，这严重降低了谷值存储信号的保真度。因此，在室温下实现高DCP对于谷值编码的纳米光子器件至关重要。在这项工作中，我们证明了通过嵌入单层MoS ₂在室温下的高DCP为48.7％变成紧凑的等离子纳米腔。事实证明，如此高的DCP归因于纳米腔中状态的简并提升的圆极化局部密度，这源于突出的手性Purcell效应。另外，DCP可以通过原位等离子体激元扫描技术进一步操纵。这种高度紧凑的系统为在室温下开发通用的谷底编码发光器件提供了可能性。

更新日期：2020-07-08

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