Observation of intrinsic intraband pi-plasmon excitation of a single-layer graphene
SCIE
SCOPUS
- Title
- Observation of intrinsic intraband pi-plasmon excitation of a single-layer graphene
- Authors
- Shin, SY; Hwang, CG; Sung, SJ; Kim, ND; Kim, HS; Chung, JW
- Date Issued
- 2011-04-16
- Publisher
- AMER PHYSICAL SOC
- Abstract
- We report the energy-momentum dispersion omega(q) of a low-energy intraband pi plasmon arising from Dirac fermions in the conduction band of a single-layer graphene (SLG), not complicated by couplings with other excitations. For a wide range of q (0.39 <= q/k(F) <= 2.36), where k(F) = 0.061 angstrom(-1) is the Fermi wave vector, the intraband plasmon survives through the interband single-particle excitation (SPE) region, and linearly disperses beyond the Landau damping q(c) = 0.90 k(F) asymptotically approaching the boundary of the interband SPE without ever entering the intraband SPE. Such a unique feature is completely distinct from the plasmon of either a multilayer graphene or a normal two-dimensional electron gas, and hence demonstrates another intrinsic nature of Dirac fermions in SLG.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/12266
- DOI
- 10.1103/PHYSREVB.83.161403
- ISSN
- 1098-0121
- Article Type
- Article
- Citation
- PHYSICAL REVIEW B, vol. 83, no. 16, 2011-04-16
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