Speaker
Description
Two-dimensional transition-metal dichalcogenides (TMDs) are atomically thin semiconductors that exhibit strong excitonic effects, high optical nonlinearities, and valley-contrasting optical selection rules. In monolayer TMDs, circularly polarized light selectively addresses the inequivalent K and K′ valleys, enabling optical initialization and readout of the valley degree of freedom. These unique properties, combined with their intrinsically planar geometry, make TMDs an attractive platform for valleytronics and their integration with nanophotonic architectures.
In this talk, I will present our recent work on hybrid TMD-nanophotonic systems, where valley-polarized excitons interact with resonant dielectric and plasmonic nanostructures. I will show how engineered optical environments can modify emission properties and enable control over the valley degree of freedom, ranging from enhanced and redirected valley-polarized photoluminescence to the manipulation of spin-valley excitations with structured light. I will further discuss hybrid platforms operating from the weak- to the strong-coupling regime, highlighting how nanophotonic design enables new opportunities for tailoring exciton-photon interactions and creating valley-dependent hybrid light-matter states. Finally, I will outline prospects for scalable valleytronic and quantum-photonic technologies based on 2D semiconductors, including integrated quantum light sources, active metasurfaces, and on-chip photonic architectures.
