{"doi":"10.1021/acsphotonics.3c01484","title":"Transport and Spatial Separation of Valley Coherence via Few Layer WS<sub>2</sub> 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) WS 2 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 a detailed experimental modal characterization of this coupled system in good agreement with the theory. Momentum space measurements reveal a degree of valley coherence in the range 30–60%. This work provides a platform for the manipulation of valley excitons in coherent light–matter states for potential implementations of valley–coherent optoelectronics.","journal":"ACS Photonics","year":2024,"id":470535,"datarank":0.0,"base_score":0.0,"endowment":0.0,"self_citation_contribution":0.0,"citation_network_contribution":0.0,"self_endowment_contribution":0.0,"citer_contribution":0.0,"corpus_percentile":null,"corpus_rank":null,"citation_count":2,"citer_count":0,"citers_with_citation_signal":0,"citers_with_endowment":0,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":0.9483,"is_data_producer":false,"deposit_databanks":null,"is_oa":true,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":"2024-01-01","fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[{"id":1299586,"name":"Wenzhuo Huang","orcid":"0000-0003-2161-3896","position":1,"is_corresponding":false},{"id":1060920,"name":"Xingwang Zhang","orcid":"0000-0002-5561-681X","position":2,"is_corresponding":false},{"id":751113,"name":"Yundong Ren","orcid":"0000-0002-4659-3046","position":3,"is_corresponding":false},{"id":1193285,"name":"Ertugrul Cubukcu","orcid":"0000-0003-2496-0156","position":4,"is_corresponding":false},{"id":397788,"name":"Chawina De-Eknamkul","orcid":"0000-0001-7776-9537","position":0,"is_corresponding":true}],"reference_count":36,"raw_metadata":null,"created_at":"2026-07-19T02:05:40.740958Z","pmid":"38576862","pmcid":null,"fwci":null,"citation_percentile":null,"influential_citations":0,"oa_status":null,"license":null,"views":0,"total_file_size_bytes":0,"version_count":0,"fair_f":null,"fair_a":null,"fair_i":null,"fair_r":null,"fair_zscore":null,"fair_rationale":null,"fair_model":null,"fair_agent_version":null,"fair_fulltext_source":null,"fair_has_llm":null,"fair_computed_at":null,"clinical_trials":[],"software_tools":[],"db_accessions":[],"linked_datasets":[],"topics":[]}