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The charge density wave (CDW) state of 2H-NbSe2 features commensurate domains separated by domain boundaries accompanied by phase slips known as discommensurations. We have unambiguously visualized the structure of CDW domains using a displacement-field measurement algorithm on a scanning tunneling microscopy image. Each CDW domain is delimited by three vertices and three edges of discommensurations and is designated by a triplet of integers whose sum identifies the types of commensurate structure. The observed structure is consistent with the alternating triangular tiling pattern predicted by a phenomenological Landau theory. The domain shape is affected by crystal defects and also by topological defects in the CDW phase factor. Our results provide a foundation for a complete understanding of the CDW state and its relation to the superconducting state.

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Keyword: Charge density waves, Transition metal dichalcogenides, Scanning tunneling microscopy

Date published: 2024-01-29

Publisher: American Physical Society (APS)

Journal:

• Physical Review Letters (ISSN: 00319007) vol. 132 issue. 5 056401

Funding:

• JSPS 20H05277 (幾何学的位相解析によるフェイゾンイメージング)
• JSPS 21K18898 (走査トンネル顕微鏡を使った分子操作によるフラットバンドエンジニアリング)
• JSPS 21H01817 (空間反転対称性の破れた原子層超伝導体におけるパリティ混成クーパー対の検出)

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

MDR DOI:

First published URL: https://doi.org/10.1103/physrevlett.132.056401

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Updated at: 2024-01-31 13:32:19 +0900

Published on MDR: 2024-01-31 16:30:17 +0900