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Low-temperature photoluminescence from MoSe2/WSe2 moiré superlattice often consists of a broad interlayer emission background with dense, narrow peaks, making microscopic line-by-line assignment difficult. Here, we use hyperspectral photoluminescence mapping and peak-decomposition-free spectral analyses to determine how this spectral complexity is organized in space. A 20 × 20 map acquired with a 400 nm pitch reveals three dominant spectral families that form contiguous real-space domains. Feature-wise spatial correlation analysis and whole-spectrum similarity yield a characteristic micron-scale length of 1.27–2.05 mm, all exceeding the 0.85 mm optical spot size. At the same time, individual pixels retain a dense, multi-peak structure, implying an unresolved local spectral manifold below optical resolution. Correlations among centroid, dominant energy, asymmetry, width, entropy, sharp fraction, and roughness indicate that the micron-scale energy landscape and local manifold complexity can be statistically separated, while remaining correlated across the map, consistent with a hierarchical organization of the emission spectrum. These results establish hierarchical inhomogeneity as an organizing principle of MoSe2/WSe2 moiré superlattice photoluminescence.

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• In Copyright
  

  This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Nurul Fariha Ahmad, Yuto Urano, Kenji Watanabe, Takashi Taniguchi, Daichi Kozawa, Ryo Kitaura; Hierarchical spectral inhomogeneity in photoluminescence of a twisted MoSe2/WSe2 heterobilayer moiré superlattice revealed by hyperspectral mapping. Appl. Phys. Lett. 8 June 2026; 128 (23): 231901 and may be found at https://doi.org/10.1063/5.0335306.

Keyword: Hyperspectral mapping, Moire superlattices

Date published: 2026-06-08

Publisher: AIP Publishing

Journal:

• APPLIED PHYSICS LETTERS (ISSN: 00036951) vol. 128 issue. 23 231901

Funding:

• Japan Society for the Promotion of Science London JP25K22210
• Japan Society for the Promotion of Science London JP24H02218
• Japan Society for the Promotion of Science London JP23H05469
• Japan Society for the Promotion of Science London JP24H01210

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.6330

First published URL: https://doi.org/10.1063/5.0335306

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Updated at: 2026-06-10 09:45:26 +0900

Published on MDR: 2026-06-10 13:14:14 +0900