Exciton Collimation, Focusing and Trapping Using Complex Transition Metal Dichalcogenide Lateral Heterojunctions
Year: 2024
Type: article
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, proof of unidirectional exciton transport from high‐ to low‐bandgap material is evidenced using a high‐quality lateral heterostructure separating transition metal dichalcogenide monolayers (TMD‐MLs). In this paper, by combining room‐temperature micro‐photoluminescence far‐field imaging with a statistical description of exciton transport, the underlying excitonic local distribution and fluxes taking place near lateral heterojunctions are unveiled. The complex 2D excitonic transport properties found near a linear interface separating WSe 2 from MoSe 2 TMD‐MLs are studied and reveal two distinct diffusion regimes profoundly affecting the effective diffusion length. Then, it is shown that combining two and three of these interfaces, allows advanced in‐plane control of the excitonic distribution and flux over large distances. Exciton focalization and trapping, allowing an increase in the local exciton density up to three orders of magnitude are demonstrated. Finally, flux collimation is achieved with the formation of parallel current lines extending a few micrometers away from the source. We believe that the deterministic shaping and positioning of the exciton distribution and flux shown here will be key toward the conception of realistic excitronic devices.
Source: Advanced Optical Materials
Authors: 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
Institutions: Centre National de la Recherche Scientifique, Centre d’Élaboration de Matériaux et d’Études Structurales, Université de Toulouse, Foundation for Research and Technology Hellas, Institut National des Sciences Appliquées de Toulouse, Laboratoire de Physique et Chimie des Nano-Objets, Friedrich Schiller University Jena, National Institute for Materials Science, Technische Universität Darmstadt
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,650
Awards: InterlagenExzitonen in hochentwickelten, auf Basis von chemischer GasphasenAbscheidung hergestellten VanderWaalsHeterostrukturen mit kontrollierter MoiréWellenlänge, SFB 1375: Nichtlineare Optik bis hin zu atomaren Skalen, G1957822890, G390482800, Untersuchung der Rolle von intrinsischen Defekten für optische und optoelektronische Eigenschaften von ÜbergangsmetallDichalkogenidMonolagen und lateralen Heterostrukturen, die durch maßgeschneiderte Synthese hergestellt wurden, Topologically induced non-reciprocal surface plasmons
OpenAlex ID: W4405792616