Tunable plasmon modes in doped AA-stacked bilayer graphene

We study plasmon modes in doped AA-stacked bilayer graphene (BLG) within the nearest-neighbor tight-binding and the random phase approximation. We obtain closed analytical expressions for the polarizability function which are used to calculate the low-energy dispersion relations of and the numerical...

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Bibliographic Details
Published in:Superlattices and microstructures 2021-08, Vol.156, p.106955, Article 106955
Main Author: Mohammadi, Yawar
Format: Article
Language:English
Subjects:
AA-stacked bilayer graphene
Plasmon
Random phase approximation
Tight-binding model
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Summary:We study plasmon modes in doped AA-stacked bilayer graphene (BLG) within the nearest-neighbor tight-binding and the random phase approximation. We obtain closed analytical expressions for the polarizability function which are used to calculate the low-energy dispersion relations of and the numerical results for both acoustic and optical plasmon modes. Our results reveal the potential of AA-stacked BLG to be used as a tunable plasmonic device. In particular we find that the long-wavelength acoustic plasmon disperses as ω+≈max(|μ|,t1)q/κ with a phase space which shrinks and vanishes as the chemical potential approaches the interlayer hopping energy, preventing the existence of long-lived acoustic plasmon. Furthermore, we show that AA-stacked BLG support long-lived optical plasmon only when the condition (1+gsgve2t1dκvF2|μ|t1)1/2
ISSN:0749-6036
1096-3677
DOI:10.1016/j.spmi.2021.106955