Why does graphene behave as a weakly interacting system
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This work addresses the puzzling weak-coupling perturbative behavior of graphene interaction effects as manifested experimentally by calculating the effect of Coulomb interactions on the quasiparticle properties to next-to-leading order in the random phase approximation (RPA).Abstract:
We address the puzzling weak-coupling perturbative behavior of graphene interaction effects as manifested experimentally, in spite of the effective fine structure constant being large, by calculating the effect of Coulomb interactions on the quasiparticle properties to next-to-leading order in the random phase approximation (RPA). The focus of our work is graphene suspended in vacuum, where electron-electron interactions are strong and the system is manifestly in a nonperturbative regime. We report results for the quasiparticle residue and the Fermi velocity renormalization at low carrier density. The smallness of the next-to-leading order corrections that we obtain demonstrates that the RPA theory converges rapidly and thus, in contrast to the usual perturbative expansion in the bare coupling constant, constitutes a quantitatively predictive theory of graphene many-body physics for any coupling strength.read more
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Hydrodynamics of electrons in graphene
Andrew Lucas,Kin Chung Fong +1 more
TL;DR: A review of recent progress in understanding the hydrodynamic limit of electronic motion in graphene can be found in this paper, where the phase diagram of graphene is discussed, and the inevitable presence of impurities and phonons in experimental systems.
Journal ArticleDOI
Hydrodynamics of electrons in graphene
Andrew Lucas,Kin Chung Fong +1 more
TL;DR: A review of recent progress in understanding the hydrodynamic limit of electronic motion in graphene is presented, written for physicists from diverse communities with no prior knowledge of hydrodynamics.
Journal ArticleDOI
Landau level spectroscopy of electron-electron interactions in graphene.
Clément Faugeras,Stéphane Berciaud,P. Leszczynski,Y. Henni,K. Nogajewski,Milan Orlita,T. Taniguchi,Kenji Watanabe,Carlos Forsythe,Philip Kim,Rashid Jalil,Andre K. Geim,Denis M. Basko,Marek Potemski +13 more
TL;DR: Raman active, zero-momentum inter-Landau level excitations in graphene are sensitive to electron-electron interactions due to the nonapplicability of the Kohn theorem in this system, with a clearly nonparabolic dispersion relation.
Journal ArticleDOI
Bielectron vortices in two-dimensional Dirac semimetals
TL;DR: Two-dimensional Dirac semimetals are known to host fermionic excitations which can mimic physics usually found in ultrarelativistic quantum mechanics, and the authors unveil the existence of another type of quasiparticle, bielectron vortices, which are bosonic and may give rise to new types of condensates.
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Interacting Dirac liquid in three-dimensional semimetals
TL;DR: In this article, the authors studied the properties of the interacting Dirac liquid, a three-dimensional many-body system which was recently experimentally realized and in which the electrons have a chiral linear relativistic dispersion and a mutual Coulomb interaction.