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arXiv · 2511.16539

Probing moire excitons in MoSe2/WSe2 heterobilayers by combined micro-photoluminescence and lateral force microscopy

L. Caussou·H. Moutaabbid·M. Bernard·F. Margaillan·T. Taniguchi·K. Watanabe·C. Lagoin·F. Dubin·V. Voliotis
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Abstract

We study interlayer excitons in MoSe2/WSe2 heterobilayers, by combining lateral force microscopy and micro-photoluminescence spectroscopy. This allows us to correlate the spatial profile of the moir\'e superlattice with the distribution of optically active states accessible to interlayer excitons. In heterostructures where a few degrees twist angle is imposed between the MoSe and WSe crystallographic axes, we show that a continuous moir\'e lattice is realized across areas close to the optical diffraction limit. In such regions, the photoluminescence reduces to a few narrow-band lines only, energetically distributed consistently with the geometry of the moir\'e lattice. This correlation reveals that interlayer excitons explore a controlled periodic confinement, paving the way towards implementations of Bose-Hubbard models.

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L. Caussou, H. Moutaabbid, M. Bernard, F. Margaillan, T. Taniguchi, K. Watanabe, C. Lagoin, F. Dubin, V. Voliotis. 2025-11-20. Probing moire excitons in MoSe2/WSe2 heterobilayers by combined micro-photoluminescence and lateral force microscopy. https://arxiv.org/abs/2511.16539

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