Article Exciton Collimation, Focusing and Trapping Using Complex Transition Metal Dichalcogenide Lateral Heterojunctions

Hassan Lamsaadi ; Aurelien Cuche ; Gonzague Agez ; Ioannis Paradisanos ; Dorian Beret ; Laurent Lombez ; Pierre Renucci ; Delphine Lagarde ; Xavier Marie ; Ziyang Gan ; Antony George ; Kenji Watanabe SAMURAI ORCID (National Institute for Materials Science) ; Takashi Taniguchi SAMURAI ORCID (National Institute for Materials Science) ; Andrey Turchanin ; Nicolas Combe ; Bernhard Urbaszek ; Vincent Paillard ; Jean‐Marie Poumirol

Advanced Optical Materials - 2024 - Lamsaadi - Exciton Collimation Focusing and Trapping Using Complex Transition Metal.pdf
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Hassan Lamsaadi, Aurelien Cuche, Gonzague Agez, Ioannis Paradisanos, Dorian Beret, Laurent Lombez, Pierre Renucci, Delphine Lagarde, Xavier Marie, Ziyang Gan, Antony George, Kenji Watanabe, Takashi Taniguchi, Andrey Turchanin, Nicolas Combe, Bernhard Urbaszek, Vincent Paillard, Jean‐Marie Poumirol. Exciton Collimation, Focusing and Trapping Using Complex Transition Metal Dichalcogenide Lateral Heterojunctions. Advanced Optical Materials. 2024, 13 (10), 2403009. https://doi.org/10.1002/adom.202403009

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(abstract)

Controlling the motion of neutral excitons in optically active media is a mandatory development to enable the conception of advanced circuits and devices for applications in excitronics, quantum photonics and optoelectronics. Recently, a proof of unidirectional (1D) exciton transport from high- to low-band-gap material has been evidenced using a high-quality lateral heterostructure separating transition metal dichalcogenide monolayers (TMD-MLs). In this paper, by combining room-temperature micro-photoluminescence (μ-PL) far-field imaging with a statistical description of exciton transport, we unveiled the underlying excitonic local distribution and fluxes taking place near lateral heterojunctions (LHs). We studied the complex 2D excitonic transport properties found near a such linear interface separating WSe2 from MoSe2 TMD-MLs and reveal two distinct diffusion regimes profoundly affecting the effective diffusion length. Then, we showed that combining two and three of this interfaces together, in naturally occurring geometries, allows advanced in-plane control of the excitonic distribution and flux over large distances. We demonstrate exciton focalisation and trapping allowing an increase of the local exciton density up to three orders of magnitude. Finally, we achieve flux collimation with the formation of parallel current lines extending few micrometers away from the source. We believe that the deterministic shaping and positioning of the exciton distribution and flux we demonstrated here will be a key towards the conception of realistic excitronic devices.

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Keyword: exciton transport
, lateral heterojunctions, TMD monolayers


Date published: 2024-12-25

Publisher: Wiley

Journal:

  • Advanced Optical Materials (ISSN: 21951071) vol. 13 issue. 10 2403009

Funding:

  • Deutsche Forschungsgemeinschaft CRC 1375 NOA (Project B2 398816777)
  • Deutsche Forschungsgemeinschaft SPP2244 (Project TU149/21‐1 443361515)
  • Deutsche Forschungsgemeinschaft TU149/16‐1 (464283495)
  • Agence Nationale de la Recherche ANR‐21‐CE30‐0042

Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.1002/adom.202403009

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Updated at: 2026-02-17 16:30:10 +0900

Published on MDR: 2026-02-17 13:11:22 +0900

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