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Philip Hofmann

Manifestation of nonlocal electron-electron interaction in graphene

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  • Soren Ulstrup
  • Malte Schueler, Univ Bremen, University of Bremen, Bremen Ctr Computat Mat Sci
  • ,
  • Marco Bianchi
  • Felix Fromm, Tech Univ Chemnitz, Technische Universitat Chemnitz, Inst Phys
  • ,
  • Christian Raidel, Tech Univ Chemnitz, Technische Universitat Chemnitz, Inst Phys
  • ,
  • Thomas Seyller, Tech Univ Chemnitz, Technische Universitat Chemnitz, Inst Phys
  • ,
  • Tim Wehling, Univ Bremen, University of Bremen, Bremen Ctr Computat Mat Sci
  • ,
  • Philip Hofmann

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 single-particle effects and local self-energies alone, but that nonlocal many-body effects, in particular exchange interactions, must be taken into account.

OriginalsprogEngelsk
Artikelnummer081403
TidsskriftPhysical Review B
Vol/bind94
Nummer8
Antal sider5
ISSN2469-9950
DOI
StatusUdgivet - 5 aug. 2016

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