Physics – Condensed Matter – Materials Science
Scientific paper
2011-06-28
PNAS 2011 vol. 108 no. 28 11365-11369
Physics
Condensed Matter
Materials Science
PNAS 2011 ; published ahead of print June 27, 2011
Scientific paper
10.1073/pnas.1100242108
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.
Deslippe Jack
Fedorov Alexei V.
Hwang Choongyu
Lanzara Alessandra
Louie Steven G.
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