Charge response function and a novel plasmon mode in graphene

Update Item Information
Publication Type Journal Article
School or College College of Science
Department Physics
Creator Mishchenko, Eugene
Other Author Gangadharaiah, S.; Farid, A. M.
Title Charge response function and a novel plasmon mode in graphene
Date 2008-04
Description Polarizability of noninteracting 2D Dirac electrons has a 1 1 / √qv-ω singularity at the boundary of electron-hole excitations. The screening of this singularity by long-range electron-electron interactions is usually treated within the random phase approximation. The latter is exact only in the limit of N →∞, where N is the ‘‘color'' degeneracy.We find that the ladder-type vertex corrections become crucial close to the threshold as the ratio of the nth order ladder term to the same order random phase approximation contribution is lnn|qv - ω|/Nn. We perform an analytical summation of the infinite series of ladder diagrams which describe the excitonic effect. Beyond the threshold, qv > ω, the real part of the polarization operator is found to be positive leading to the appearance of a strong and narrow plasmon resonance.
Type Text
Publisher American Physical Society
Journal Title Physical Review Letters
Volume 100
Issue 16
DOI 10.1103/PhysRevLett.100.166802
citatation_issn 0031-9007
Subject Excitons; Random phase approximation
Subject LCSH Graphene; Plasmons; Nanotubes; Electron-electron interactions; Particles (Nuclear physics)
Language eng
Bibliographic Citation Gangadharaiah, S., Farid, A. M., & Mishchenko, E. G. (2008). Charge response function and a novel plasmon mode in graphene. Physical Review Letters, 100(16), 166802.
Rights Management (c) American Physical Society http://dx.doi.org/10.1103/PhysRevLett.100.166802
Format Medium application/pdf
Format Extent 250,579 bytes
Identifier ir-main,11781
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Reference URL https://collections.lib.utah.edu/ark:/87278/s63x8r9x