Wannier excitons signalling strong Coulomb coupling in graphene

Johanna Grönqvist, T. Stroucken, Markus Lindberg, S.W. Koch

Research output: Contribution to journalArticleScientificpeer-review


The Wannier equation for quasiparticles with a linear dispersion is investigated. It is shown that Coulomb bound compounds of mass less electron-hole pairs can only exist if the effective coupling strength exceeds the critical value of approximately 0.46. At the critical value, a second-order transition to a weak Coulomb regime is found. It is shown that the existence of bound excitons indicates an instability of the noninteracting ground state.
Original languageEnglish
JournalEuropean Physical Journal B: Condensed Matter and Complex Systems
Issue number395
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed


  • graphene
  • exciton
  • many-body theory


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