Transport and Spatial Separation of Valley Coherence via Few Layer WS₂ Exciton-Polaritons.

ABSTRACT: The optical response in two-dimensional transition-metal dichalcogenides (2D TMDCs) is dominated by excitons. The lack of spatial inversion symmetry in the hexagonal lattice within each TMDC layer leads to valley-dependent excitonic emission of photoluminescence. Here, we demonstrate experimentally the spatial separation of valley coherent emission into orthogonal directions through self-resonant exciton polaritons of a free-standing three-layer (3L) WS₂ waveguide. This was achieved by patterning a photonic crystal consisting of a square array of holes allowing for the far field probing of valley coherence of engendered exciton-polaritons. Furthermore, we report detailed experimental modal characterization of this coupled system in good agreement with theory. Momentum space meas

SUBMITTER: De-Eknamkul C 

PROVIDER: S-EPMC10993736 | biostudies-literature | 2024 Mar

REPOSITORIES: biostudies-literature