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Condensed Matter > Mesoscale and Nanoscale Physics

arXiv:2301.11646 (cond-mat)
[Submitted on 26 Jan 2023]

Title:Real-space imaging of the tailored plasmons in twisted bilayer graphene

Authors:Fengrui Hu, Suprem R Das, Yilong Luan, T.-F. Chung, Yong P. Chen, Zhe Fei
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Abstract:We report a systematic plasmonic study of twisted bilayer graphene (TBLG) - two graphene layers stacked with a twist angle. Through real-space nanoimaging of TBLG single crystals with a wide distribution of twist angles, we find that TBLG supports confined infrared plasmons that are sensitively dependent on the twist angle. At small twist angles, TBLG has a plasmon wavelength comparable to that of single-layer graphene. At larger twist angles, the plasmon wavelength of TBLG increases significantly with apparently lower damping. Further analysis and modeling indicate that the observed twist-angle dependence of TBLG plasmons in the Dirac linear regime is mainly due to the Fermi-velocity renormalization, a direct consequence of interlayer electronic coupling. Our work unveils the tailored plasmonic characteristics of TBLG and deepens our understanding of the intriguing nano-optical physics in novel van der Waals coupled two-dimensional materials.
Comments: 22 pages
Subjects: Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Materials Science (cond-mat.mtrl-sci); Optics (physics.optics)
Cite as: arXiv:2301.11646 [cond-mat.mes-hall]
  (or arXiv:2301.11646v1 [cond-mat.mes-hall] for this version)
  https://doi.org/10.48550/arXiv.2301.11646
Journal reference: Phys. Rev. Lett. 119, 247402 (2017)
Related DOI: https://doi.org/10.1103/PhysRevLett.119.247402

Submission history

From: Zhe Fei [view email]
[v1] Thu, 26 Jan 2023 15:36:26 UTC (4,542 KB)
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