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Many-body interactions in quasi-freestanding graphene
Cited 165 time in
Web of Science
Cited 170 time in Scopus
- Authors
- Issue Date
- 2011-07
- Publisher
- National Academy of Sciences
- Citation
- Proceedings of the National Academy of Sciences of the United States of America, Vol.108 No.28, pp.11365-11369
- 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 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. band structure dielectric screening fine structure constant density functional theory self-energy.
- ISSN
- 0027-8424
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