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

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.

arXiv comment22 pages

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• Emerging chiral optics from chiral interfaces
• Surfactant-Mediated Epitaxial Growth of Single-Layer Graphene in an Unconventional Orientation on SiC
• Theory of plasmonic edge states in chiral bilayer systems
• Plasmonic Quantum Dots in Twisted Bilayer Graphene
• Imaging Stacking-Dependent Surface Plasmon Polaritons in Trilayer Graphene
• Flat and Correlated Plasmon Bands in Graphene/$\alpha$-RuCl${}_3$ Heterostructures
• Neutral magic-angle bilayer graphene: Condon instability and chiral resonances
• Many-body perturbation theory for moiré systems
• Twist Angle-Dependent Bands and Valley Inversion in 2D Materials/hBN Heterostructures
• Featuring nuanced electronic band structure in gapped multilayer graphene
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