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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 measurements reveal a degree of valley coherence in the range 30-60%. This work provides a platform for manipulation of valley excitons in coherent light-matter states for potential implementations of valley-coherent optoelectronics.

SUBMITTER: De-Eknamkul C 

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

REPOSITORIES: biostudies-literature

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Transport and Spatial Separation of Valley Coherence via Few Layer WS<sub>2</sub> Exciton-Polaritons.

De-Eknamkul Chawina C   Huang Wenzhuo W   Zhang Xingwang X   Ren Yundong Y   Cubukcu Ertugrul E  

ACS photonics 20240220 3

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) WS<sub>2</sub> waveguide. This was achieved b  ...[more]

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