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HL: Fachverband Halbleiterphysik
HL 59: 2D Semiconductors and van der Waals Heterostructures VI
HL 59.8: Vortrag
Freitag, 21. März 2025, 11:30–11:45, H15
Laterally extended states of interlayer excitons in reconstructed MoSe2/WSe2 heterostructures — •Johannes Figueiredo1,2, Marten Richter3, Mirco Troue1,2, Jonas Kiemle1,2, Hendrik Lambers4, Torsten Stiehm4, Ursula Wurstbauer4, Andreas Knorr3, and Alexander Holleitner1,2 — 1Walter Schottky Institute, TU Munich — 2Munich Center for Quantum Science and Technology (MCQST) — 3Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, TU Berlin — 4Institute of Physics, Münster University
Heterostructures made from 2D transition-metal dichalcogenides are ideal platforms for exploring excitonic phenomena, including correlated moiré excitons and degenerate interlayer exciton ensembles. While atomic reconstruction is often assumed to localize excitons, we demonstrate that excitonic states in reconstructed MoSe2/WSe2 heterostructures can extend beyond the moiré periodicity [1]. Using real-space calculations, we provide lateral potential maps and corresponding excitonic wavefunctions for interlayer excitons in strain-relaxed heterostructures [2]. Cryogenic photoluminescence experiments corroborate the computed level structure and exciton relaxation dynamics. These findings align with recent coherence measurements on degenerate interlayer excitons and suggest potential many-body phenomena in dense, cold exciton ensembles [3].
[1] J. Figueiredo et al., arXiv:2411.19616 (2024) [2] M. Richter, PRB 109, 125308 (2024) [3] M. Troue and J. Figueiredo et al., PRL 131, 036902 (2023)
Keywords: Interlayer Excitons