Quantum plasmons with optical-range frequencies in doped few-layer graphene
Name
PhysRevB.97.195435.pdf
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938.12 KB
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Checksum (MD5)
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Author(s)
Shirodkar, Sharmila N.
Mattheakis, Marios
Cazeaux, Paul
Narang, Prineha
Kaxiras, Efthimios
Soljacic, Marin
Date Issued
May 2018
Journal
Physical Review B
Publisher
American Physical Society
Citation
Shirodkar, Sharmila N., et al. “Quantum Plasmons with Optical-Range Frequencies in Doped Few-Layer Graphene.” Physical Review B, vol. 97, no. 19, May 2018. © 2018 American Physical Society
Version
Final published version
Abstract
Although plasmon modes exist in doped graphene, the limited range of doping achieved by gating restricts the plasmon frequencies to a range that does not include the visible and infrared. Here we show, through the use of first-principles calculations, that the high levels of doping achieved by lithium intercalation in bilayer and trilayer graphene shift the plasmon frequencies into the visible range. To obtain physically meaningful results, we introduce a correction of the effect of plasmon interaction across the vacuum separating periodic images of the doped graphene layers, consisting of transparent boundary conditions in the direction perpendicular to the layers; this represents a significant improvement over the exact Coulomb cutoff technique employed in earlier works. The resulting plasmon modes are due to local field effects and the nonlocal response of the material to external electromagnetic fields, requiring a fully quantum mechanical treatment. We describe the features of these quantum plasmons, including the dispersion relation, losses, and field localization. Our findings point to a strategy for fine-tuning the plasmon frequencies in graphene and other two-dimensional materials.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.97.195435
