Manifestation of nonlocal electron-electron interaction in graphene

Abstract

Graphene is an ideal platform to study many-body effects due to its semimetallic character and the possibility to dope it over a wide range. Here we study the width of graphene's occupied $\pi$-band as a function of doping using angle-resolved photoemission. Upon increasing electron doping, we observe the expected shift of the band to higher binding energies. However, this shift is not rigid and the bottom of the band moves less than the Dirac point. We show that the observed shift cannot be accounted for by band structure calculations in the local density approximation but that non-local exchange interactions must be taken into account.

arXiv comment5 pages, 3 figures

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• Momentum-resolved view of highly tunable many-body effects in a graphene/hBN field-effect device
• Bandwidth renormalization due to the intersite Coulomb interaction
• Transient Hot Electron Dynamics in Single-Layer TaS${}_2$
• Exploring the role of nonlocal Coulomb interactions in perovskite transition metal oxides
• A density of states approach to the hexagonal Hubbard model at finite density
• A Hybrid-Monte-Carlo study of monolayer graphene with partially screened Coulomb interactions at finite spin density
• Quantum phase transitions on the hexagonal lattice