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27 April 2024 |
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Article overview
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Many-body interactions in quasi-freestanding graphene | | David A. Siegel
; Cheol-Hwan Park
; Choongyu Hwang
; Jack Deslippe
; Alexei V. Fedorov
; Steven G. Louie
; Alessandra Lanzara
; | | Date: |
29 Jun 2011 | | 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. | | Source: | arXiv, 1106.5822 | | Services: | Forum | Review | PDF | Favorites | |
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