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説明:

The phenomena of pronounced electron-electron and electron-phonon interactions in one-dimensional (1D) systems are ubiquitous, which are well described by frameworks of Luttinger liquid, Peierls instability, and concomitant charge density wave. However, the experimental observation of strongly hybridized phonons in 1D was not demonstrated. Herein we report the first observation of strongly hybridized phonons in 1D condensed matters by using double-walled carbon nanotubes (DWNTs), representative 1D van der Waals crystals, by combining the spectroscopic and microscopic tools as well as the ab initio density functional theory (DFT) calculations. We observe uncharted phonon modes in one commensurate and three incommensurate DWNT crystals, three of which concurrently exhibit strongly reconstructed electronic band structures. Our DFT calculations for the experimentally observed commensurate DWNT (7, 7) @ (12, 12) reveal that this new phonon mode originates from a (nearly) degenerate coupling between two transverse acoustic modes (ZA modes) of constituent inner and outer nanotubes having approximately trigonal and pentagonal rotational symmetry along the nanotube circumferences. Such coupling strongly hybridizes the two phonon modes in different shells and leads to the formation of a unique lattice motion featuring evenly distributed vibrational amplitudes over inner and outer nanotubes, distinct from any known phonon modes in 1D systems. All four DWNTs that exhibit the pronounced new phonon modes show small chiral angle twists, closely matched diameter ratios of 3/5 and decreased frequencies of new phonon modes with increased diameters, all supporting the uncovered coupling mechanism. Our discovery of strongly hybridized phonons in DWNTs opens new opportunities for engineering phonons and exploring novel phonon-related phenomena in 1D condensed matters.

権利情報:

• In Copyright
  

  ©2025 American Physical Society

キーワード: phonon

刊行年月日: 2025-04-28

出版者: American Physical Society (APS)

掲載誌:

• Physical Review Letters (ISSN: 10797114) vol. 134 issue. 17 176101

研究助成金:

• National Key Research and Development Program of China 2022YFA1203400
• National Key Research and Development Program of China 2023YFA1407900
• National Natural Science Foundation of China 12174335
• National Natural Science Foundation of China 12074260
• Natural Science Foundation of Zhejiang Province LR23A040002
• Japan Society for the Promotion of Science JP24K06968
• Japan Society for the Promotion of Science 23K23161
• Japan Society for the Promotion of Science JP24H02218
• Japan Society for the Promotion of Science JP23H05469
• New York University Shanghai
• NYU-ECNU Institute of Physics

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.6062

公開URL: https://doi.org/10.1103/PhysRevLett.134.176101

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更新時刻: 2025-12-24 14:22:33 +0900

MDRでの公開時刻: 2025-12-24 16:20:30 +0900