Regular quantum plasmons in segments of graphene nanoribbons

Bao-Ji Wang, Jiazhou Lin and San-Huang Ke
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Bao-Ji Wang: MOE Key Laboratory of Microstructured Materials, School of Physics Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, P. R. China†School of Physics and Electronic Information Engineering, Henan Polytechnic University, Jiaozuo 454000, P. R. China
Jiazhou Lin: MOE Key Laboratory of Microstructured Materials, School of Physics Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, P. R. China
San-Huang Ke: MOE Key Laboratory of Microstructured Materials, School of Physics Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, P. R. China

International Journal of Modern Physics C (IJMPC), 2022, vol. 33, issue 11, 1-10

Abstract: Graphene plasmons have advantages over noble metal plasmons such as high tunability and low loss. However, for graphene nanostructures smaller than 10 nm, little is known about their plasmons or whether regular plasmonic behavior exists, despite their potential applications. Here, we present first-principles calculations of plasmon excitations in zigzag graphene nanoribbon segments. Very regular plasmonic behavior is found: Only one plasmon mode exists in the low-energy regime (<1.5 eV). The classical electrostatic scaling law still approximately holds when the width (W) is larger than ∼1.5 nm but totally fails when W<1.5 nm due to quantum effects. The scaling with different doping densities shows that the plasmon is nearly free-electron plasmon instead of Dirac plasmon.

Keywords: Quantum plasmon; graphene nanoribbon (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1142/S0129183122501418

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