Hot Dirac Fermions in Epitaxial Graphene

Dong Sun; Zong-Kwei Wu; Charles Divin; Xuebin Li; Claire Berger; Walt A. de Heer; Phillip N. First; Theodore B. Norris

Hot Dirac Fermions in Epitaxial Graphene

Materials Science 2008-12-24 v1 Strongly Correlated Electrons

Authors: Dong Sun , Zong-Kwei Wu , Charles Divin , Xuebin Li , Claire Berger , Walt A. de Heer , Phillip N. First , Theodore B. Norris

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Abstract

We investigate the ultrafast relaxation dynamics of hot Dirac fermionic quasiparticles in multilayer epitaxial graphene using ultrafast optical differential transmission spectroscopy. We observe DT spectra which are well described by interband transitions with no electron-hole interaction. Following the initial thermalization and emission of high-energy phonons, the electron cooling is determined by electron-acoustic phonon scattering, found to occur on the time scale of 1 ps for highly doped layers, and 4-11 ps in undoped layers. The spectra also provide strong evidence for the multilayer stucture and doping profile of thermally grown epitaxial graphene on SiC.

Keywords

dirac fermions graphene plasmonics phonon

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@article{arxiv.0803.2883,
  title  = {Hot Dirac Fermions in Epitaxial Graphene},
  author = {Dong Sun and Zong-Kwei Wu and Charles Divin and Xuebin Li and Claire Berger and Walt A. de Heer and Phillip N. First and Theodore B. Norris},
  journal= {arXiv preprint arXiv:0803.2883},
  year   = {2008}
}

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16 pages, 4 figures

Hot Dirac Fermions in Epitaxial Graphene

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