講演情報
[17p-M_178-3]Dipolar excitons emerging from symmetry breaking in Janus TMDCs
〇(PC)Ufuk Erkilic1,2,3, Shengnan Wang1, Yoshiaki Sekine1, Yoshitaka Taniyasu1 (1.NTT Basic Research Laboratories, 2.RIKEN Pioneering Research Institute, 3.RIKEN Center for Advanced Photonics)
キーワード：
TMDC、Janus、exciton
Janus transition metal dichalcogenides (TMDCs), formed by replacing one chalcogen layer in a monolayer TMDC, provide a unique platform for atomic-scale symmetry engineering. The resulting out-of-plane asymmetry generates an intrinsic electric field, yet its impact on exciton transport remains largely unexplored due to challenges in growing high-quality monolayers. Here we demonstrate enhanced exciton transport in high-quality Janus WSSe monolayers synthesized via a fully chemical vapor deposition–based sequential selenization process of WS2. Spatial photoluminescence imaging reveals a substantially expanded exciton cloud in WSSe compared to that in conventional WS2. Quantitative analysis shows that the exciton diffusion length in WSSe is nearly twice that of WS2, providing clear evidence of electron–hole spatial separation driven by the intrinsic electric field and establishing the dipolar nature of excitons in Janus TMDCs.