Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 108, Issue 28, Pages 11365-11369Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1100242108
Keywords
band structure; dielectric screening; fine structure constant; density functional theory; self-energy
Categories
Funding
- Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, of the US Department of Energy [DE-AC02-05CH11231]
- Office of Naval Research Multidisciplinary University Initiative [N00014-09-1-1066]
- Materials Research Science and Engineering Centers under National Science Foundation [DMR-0820382]
- National Science Foundation [DMR10-1006184]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1006184] Funding Source: National Science Foundation
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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 such as 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.
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