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Description:

Thinning van der Waals crystals to monolayers is crucial for nanoelectronic devices but often
introduces strain, altering their electronic properties. This study explores how strain affects the charge
density wave (CDW) in 2H niobium diselenide (2H-NbSe2), focusing on a transition from a 2 × 2 to a 1Q
CDW phase under weak magnetic fields (~30 mT), revealing high magnetic sensitivity. The strained
2H-NbSe2 surface, prepared via vacuum and tape exfoliation, exhibits a 2 × 2 CDW phase observed
using low-temperature (4.3 K) scanning tunneling microscopy and spectroscopy (STM/STS)
combined with scanning electron microscopy (SEM) and cross-sectional transmission electron
microscopy (TEM) under ultrahigh vacuum (UHV) conditions. STS maps show the 2 × 2 CDW around
±100 meV from the Fermi level. Upon applying a magnetic field, a localized 1Q stripe CDW pattern
emerges near ±40 meV. These results highlight the influence of strain and magnetic fields on CDW
behavior in 2D materials.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: 2H-NbSe2

Date published: 2025-07-09

Publisher: Springer Science and Business Media LLC

Journal:

• npj 2D Materials and Applications (ISSN: 23977132) vol. 9 issue. 1 59

Funding:

• Japan Society for the Promotion of Science 23H02033
• Murata Science Foundation
• Shorai Foundation for Science and Technology
• TEPCO Memorial Foundation
• Casio Science Promotion Foundation
• Toshiaki Ogasawara Memorial Foundation

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1038/s41699-025-00584-y

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Updated at: 2025-08-18 16:30:54 +0900

Published on MDR: 2025-08-18 16:21:29 +0900