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Polarization and plasmons in hot photoexcited graphene

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Title: Polarization and plasmons in hot photoexcited graphene
Authors: Page, AF
Hamm, J
Hess, O
Item Type: Journal Article
Abstract: We present a robust and exact method for calculating the polarization function and plasmon dispersion of graphene, for an arbitrary (isotropic) non-equilibrium carrier distribution, within random phase approximation (RPA). This is demonstrated for a range of carrier distributions, including hot carrier distributions which occur within the femtoseconds following photoexcitation. We show that qualitatively different behaviour from the equilibrium case can occur. As the polarization function determines dynamic screening, its calculation shall be essential to quantifying carrier-carrier scattering channels for graphene far from equilibrium.
Issue Date: 29-Jan-2018
Date of Acceptance: 17-Jan-2018
URI: http://hdl.handle.net/10044/1/56254
DOI: https://dx.doi.org/10.1103/PhysRevB.97.045428
ISSN: 1098-0121
Publisher: American Physical Society
Journal / Book Title: Physical review B: Condensed matter and materials physics
Volume: 97
Copyright Statement: ©2018 American Physical Society
Sponsor/Funder: Engineering & Physical Science Research Council (E
Engineering & Physical Science Research Council (EPSRC)
Engineering and Physical Sciences Research Council
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: RG72590
EP/L024926/1
EP/L024926/1
DOCTORAL PRIZE
Keywords: Science & Technology
Physical Sciences
Physics, Condensed Matter
Physics
2-DIMENSIONAL ELECTRON-GAS
QUASI-PARTICLE
DYNAMICS
Random phase approximation
Graphene
Dirac fermions
Optical conductivity
Plasmons
Temperature
Publication Status: Published
Article Number: 045428
Appears in Collections:Condensed Matter Theory
Physics
Faculty of Natural Sciences



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