Abstract
Abstract Atomically thin, two-dimensional, transition-metal dichalcogenide (TMD) monolayers have recently emerged as a versatile platform for optoelectronics. Their appeal stems from a tunable direct bandgap in the visible and near-infrared regions, the ability to enable strong coupling to light, and the unique opportunity to address the valley degree of freedom over atomically thin layers. Additionally, monolayer TMDs can host defect-bound localized excitons that behave as single-photon emitters, opening exciting avenues for highly integrated 2D quantum photonic circuitry. By introducing plasmonic nanostructures and metasurfaces, one may effectively enhance light harvesting, direct valley-polarized emission, and route valley index. This review article focuses on these critical aspects to develop integrated photonic and valleytronic applications by exploiting exciton–plasmon coupling over a new hybrid material platform.
Highlights
Two-dimensional semiconductors have attracted much interest in the last decade as a new material platform for valleytronics and optoelectronics [1,2,3,4]
Atomically thin, two-dimensional, transitionmetal dichalcogenide (TMD) monolayers have recently emerged as a versatile platform for optoelectronics
Particular attention has been devoted to monolayer (ML) transition-metal dichalcogenides (TMDs), which are formed by a layer of transition-metal atoms [such as molybdenum (Mo) and tungsten (W)] sandwiched between two layers of chalcogenide atoms [such as sulfur (S) and selenium (Se)], with the metal and chalcogen atoms occupying the A and B sites of a hexagonal lattice (Figure 1)
Summary
Two-dimensional semiconductors have attracted much interest in the last decade as a new material platform for valleytronics and optoelectronics [1,2,3,4]. In Mo-based TMD monolayers, the lowest exciton resonance is a dipole-allowed transition, while this transition corresponds to dark excitons in W-based TMD monolayers [5, 6] These materials feature a combination of unique optical properties. In addition to mobile excitons, ML TMDs can host localized excitons that are bound to the defects and behave as spectrally narrow single-photon emitters [18,19,20] These localized emission centers often appear at the ML edges, but they can be created or enhanced at specific positions by locally engineering the strain. Cotrufo et al.: Enhancing functionalities of atomically thin semiconductors the chirality of plasmonic fields is combined with the valley-selective response of TMD materials to increase valley polarization, direct valley-selective emissions, and a spatially separate valley index by exploiting exciton– plasmon coupling
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