Many-body interactions in quasi-freestanding graphene
Abstract
The Landau-Fermi liquid picture for quasiparticles assumes that charge carriers are dressed by many-body interactions, forming one of the fundamental theories of solids. Whether this picture still holds for a semimetal like graphene at the neutrality point, i.e., when the chemical potential coincides with the Dirac point energy, is one of the long-standing puzzles in this field. Here we present such a study in quasi-freestanding graphene by using high-resolution angle-resolved photoemission spectroscopy. We see the electron-electron and electron-phonon interactions go through substantial changes when the semimetallic regime is approached, including renormalizations due to strong electron-electron interactions with similarities to marginal Fermi liquid behavior. These findings set a new benchmark in our understanding of many-body physics in graphene and a variety of novel materials with Dirac fermions.
Keywords
Cite
@article{arxiv.1106.5822,
title = {Many-body interactions in quasi-freestanding graphene},
author = {David A. Siegel and Cheol-Hwan Park and Choongyu Hwang and Jack Deslippe and Alexei V. Fedorov and Steven G. Louie and Alessandra Lanzara},
journal= {arXiv preprint arXiv:1106.5822},
year = {2011}
}
Comments
PNAS 2011 ; published ahead of print June 27, 2011