Creation of Single-Photon Emitters in WSe2 Monolayers Using Nanometer-Sized Gold Tips.,Nano Letters

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Creation of Single-Photon Emitters in WSe2 Monolayers Using Nanometer-Sized Gold Tips.
Nano Letters ( IF 9.6 ) Pub Date : 2020-07-09 , DOI: 10.1021/acs.nanolett.0c01789
Lintao Peng ₁ , Henry Chan ₁ , Priscilla Choo _{2,

3} , Teri W Odom _{2,

3} , Subramanian K R S Sankaranarayanan _{1,

4} , Xuedan Ma ₁

Affiliation

Due to their tunable bandgaps and strong spin-valley locking, transition metal dichalcogenides constitute a unique platform for hosting single-photon emitters. Here, we present a versatile approach for creating bright single-photon emitters in WSe₂ monolayers by the deposition of gold nanostars. Our molecular dynamics simulations reveal that the formation of the quantum emitters is likely caused by the highly localized strain fields created by the sharp tips of the gold nanostars. The surface plasmon modes supported by the gold nanostars can change the local electromagnetic fields in the vicinity of the quantum emitters, leading to their enhanced emission intensities. Moreover, by correlating the emission energies and intensities of the quantum emitters, we are able to associate them with two types of strain fields and derive the existence of a low-lying dark state in their electronic structures. Our findings are highly relevant for the development and understanding of single-photon emitters in transition metal dichalcogenide materials.

中文翻译：

使用纳米尺寸的金针尖在WSe2单层中创建单光子发射极。

由于其可调节的带隙和强大的自旋谷锁定，过渡金属二硫化碳构成了容纳单光子发射器的独特平台。在这里，我们提出了一种在WSe _2中创建明亮的单光子发射器的通用方法通过沉积金纳米星形成单层。我们的分子动力学模拟表明，量子发射体的形成可能是由金纳米星尖锐尖端产生的高度局部应变场引起的。金纳米星所支持的表面等离子体激元模式可以改变量子发射体附近的局部电磁场，从而提高其发射强度。此外，通过关联量子发射器的发射能量和强度，我们能够将它们与两种类型的应变场相关联，并推导它们的电子结构中存在低洼暗态。我们的发现与过渡金属二卤化碳材料中单光子发射器的开发和理解高度相关。

更新日期：2020-08-12

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