Multidimensional spectro-temporal imaging of exciton dynamics under propagating acoustic strain in two-dimensional semiconductors.

Authors

Yuta Takahashi, Takumi Yamamoto, Hidetoshi Kanzawa, Kazuki Maezawa, Hajime Kumazaki, Yuichiro K Kato, Shinichi Watanabe, Shun Fujii

Published in

Science advances. Volume 12. Issue 34. Pages eaef5458. Aug 21, 2026. Epub Aug 21, 2026.

Abstract

Dynamic strain offers a promising route to manipulate tightly bound excitons in two-dimensional semiconductors. Its impact, however, has so far been inferred primarily from time-averaged or spatially integrated measurements. In particular, for dynamic strain driven by surface acoustic waves (SAWs), the relatively small strain amplitude and competing piezoelectric effects have hindered direct access to the real-time evolution of exciton emission energy and recombination dynamics within a single acoustic cycle. Here we report a fully phase-synchronized, multidimensional spectro-temporal-spatial visualization of exciton emission in monolayer tungsten diselenide driven by propagating SAWs. By integrating phase-resolved microscopy and interferometric surface displacement measurements, we achieve simultaneous mapping of exciton emission energy, photoluminescence intensity, linewidth, and decay dynamics and directly correlate them with the dynamic strain field. Our work establishes propagating acoustic strain as a powerful platform for deterministic exciton control and provides a comprehensive framework for exploring nonequilibrium exciton dynamics in low-dimensional materials.

PMID:
42627908
Bibliographic data and abstract were imported from PubMed on 22 Aug 2026.

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