Dresden 2026 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 13: 2D Materials III – Interlayer excitons

HL 13.4: Vortrag

Montag, 9. März 2026, 17:30–17:45, POT/0081

Optical Injection and Detection of Long-Lived Interlayer Excitons in van der Waals Heterostructures — •Anna Seiler, Alperen Tügen, Arthur Christianen, Martin Kroner, and Atac Imamoglu — ETH Zurich, Switzerland

Interlayer excitons, electron-hole pairs spatially separated between two layers of 2D materials, have gained attention for their potential to enable the exploration of bosonic quantum phases. A promising strategy to stabilize these excitons is to use transition metal dichalcogenide (TMD) bilayer structures, where the two TMD layers are separated by a few layers of hexagonal boron nitride (hBN), effectively isolating itinerant electrons and holes. While these systems have primarily been studied through transport measurements, challenges such as difficulties in making ohmic contacts to TMD monolayers and the lack of photoluminescence have limited their broader exploration. Here, we demonstrate optical generation of dipolar interlayer excitons in TMD bilayers separated by up to seven hBN layers. We observe that the 2s excitons in the individual layers remain intact in the presence of opposite charges in both layers, suggesting that the oppositely charged carriers are strongly bound, forming stable interlayer excitons. We measure exciton lifetimes up to ten microseconds, underscoring their potential for studying exotic quantum phases such as Bose-Fermi mixtures and excitonic condensates [1]. These phenomena can be accessed through optical spectroscopy, enabling future exploration.

[1] A. Tüğen, A. M. Seiler, et al., Phys. Rev. Lett. DOI: https://doi.org/10.1103/stgs-2s58

Keywords: interlayer excitons; transition metal dichalcogenides; optical spectroscopy; van der Waals Heterostructures; 2D materials