论文标题
表面声波中的2D半导体中的激子 - 平面耦合
Exciton-Plasmon Coupling in 2D Semiconductors by Surface Acoustic Waves
论文作者
论文摘要
从理论上讲，我们通过表面声波（SAW）在薄金属膜中的2D半导体中的激子与表面等离子体之间的耦合，证明在强耦合方案中，生成的激子 - 平面偏振子（或plexcitons）是在强的耦合方案中。锯的应变场产生了动态衍射光栅，为表面等离子提供了动量匹配，而金属可以取消了可以解离激素的压电场。这是单层MOS $ \ MATHRM {_ {_ {2}} $以及单层和几层黑色磷在Linbo $ \ Mathrm {_ {_ {3}} $ piezoelectric substrate上的薄银层，提供100-150 mev。因此，我们证明锯是通过由声音传感器量身定制的高频局部变形来调节受支持的2D半导体的光学特性的强大工具，可以用作适用于用于活性高速纳米型高速含量纳米通用的plexciton的电气切换发射器。
We theoretically demonstrate the coupling between excitons in 2D semiconductors and surface plasmons in a thin metal film by means of a surface acoustic wave (SAW), proving that the generated exciton-plasmon polaritons (or plexcitons) are in the strong coupling regime. The strain field of the SAW creates a dynamic diffraction grating providing the momentum match for the surface plasmons, whereas the piezoelectric field, that could dissociate the excitons, is cancelled out by the metal. This is exemplified for monolayer MoS$\mathrm{_{2}}$ and mono- and few-layer black phosphorus on top of a thin silver layer on a LiNbO$\mathrm{_{3}}$ piezoelectric substrate, providing Rabi splittings of 100-150 meV. Thus, we demonstrate that SAWs are powerful tools to modulate the optical properties of supported 2D semiconductors by means of the high-frequency localized deformations tailored by the acoustic transducers, that can serve as electrically switchable launchers of propagating plexcitons suitable for active high-speed nanophotonic applications.
