Regensburg 2025 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 31: Focus Session: Young Semiconductor Forum Poster

HL 31.3: Poster

Mittwoch, 19. März 2025, 12:15–13:00, H13

1D exciton confinement in monolayer MoSe₂ near ferroelectric domain walls in periodically poled LiNBo₃ — •Pedro Soubelet, Yao Tong, Asier Astaburuaga Hernandez, Andreas V. Stier, and Jonathan J. Finley — Walter Schottky Institut and TUM School of Natural Sciences, Technische Universität München, Am Coulombwall 4, 85748 Garching, Germany

Monolayer transition metal dichalcogenides are an emergent platform for exploring and engineering quantum phenomena in condensed matter. Due to their atomic thickness, the excitonic response is highly influenced by the dielectric environment. In this work, we explore the optical properties and exciton kinetics of monolayer thick MoSe₂ straddling domain wall boundaries in ferroelectric periodically poled LiNbO₃ (PPLN). Spatially resolved photoluminescence (PL) experiments reveal sorting of neutral and charged excitons across the boundary. Our results reveal evidence for extremely large in-plane electric fields (≃4000 kV/cm) at the domain wall (DW), whose effect is manifested in the routing of free charges and trions towards oppositely poled domains, resulting in a nonintuitive spatial PL intensity pattern. In a second step, we engineer the PPLN substrate and the 2D heterostructure to exploit the non-uniform in-plane electric field exerted by the DW to confine neutral excitons in a 1D dipolar gas. Reducing the dimensionality holds an excellent potential for unlocking strong exciton-exciton interaction regimes, enabling exploration of exotic quantum phases of matter and designing advanced optoelectronic devices.

Keywords: Transition Metal Dichalcogenides; Periodically poled lithium niobate; 1D dipolar exciton gas