Controlling exciton dynamics in two-dimensional MoS2 on hyperbolic metamaterial-based nanophotonic platform

TL;DR

This paper demonstrates the first control of exciton dynamics in MoS2 monolayers using hyperbolic metamaterials, revealing mechanisms of exciton migration and enhancing F"orster radius through nanophotonic engineering.

Contribution

It introduces a novel approach to manipulate exciton behavior in 2D TMDs via hyperbolic metamaterials, a previously unexplored integration in nanophotonics.

Findings

F"orster radius of A-excitons increased by HMMs

Exciton migration mechanisms in MoS2 elucidated

Diffusion coefficient for C-excitons unchanged

Abstract

The discovery of two-dimensional transition metal dichalcogenides (2D TMDs) has promised next-generation photonics and optoelectronics applications, particularly in the realm of nanophotonics. Arguably, the most crucial fundamental processes in these applications are the exciton migration and charge transfer in 2D TMDs. However, exciton dynamics in 2D TMDs have never been studied on a nanophotonic platform and more importantly, the control of exciton dynamics by means of nanophotonic structures has yet to be explored. Here, for the first time, we demonstrate the control of exciton dynamics in MoS2 monolayers by introducing a hyperbolic metamaterial (HMM) substrate. We reveal the migration mechanisms of various excitons in MoS2 monolayers. Furthermore, we demonstrate the F\"orster radius of the A-excitons can be increased by introducing HMMs through the nonlocal effects of HMMs due to the Purcell effect. On the other hand, the diffusion coefficient is unchanged for the C-excitons on HMMs. This study provides a revolutionary step forward in enabling 2D TMD nanophotonics hybrid devices.