Wannier excitons signalling strong Coulomb coupling in graphene

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

doi:10.1140/epjb/e2012-30593-0

Wannier excitons signalling strong Coulomb coupling in graphene

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

Physics

Research output: Contribution to journal › Article › Scientific › peer-review

Abstract

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 language	English
Journal	European Physical Journal B: Condensed Matter and Complex Systems
Volume	85
Issue number	395
DOIs	https://doi.org/10.1140/epjb/e2012-30593-0
Publication status	Published - 2012
MoE publication type	A1 Journal article-refereed

Keywords

graphene
exciton
many-body theory

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10.1140/epjb/e2012-30593-0

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title = "Wannier excitons signalling strong Coulomb coupling in graphene",

abstract = "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.",

keywords = "graphene, exciton, many-body theory",

author = "Johanna Gr{\"o}nqvist and T. Stroucken and Markus Lindberg and S.W. Koch",

year = "2012",

doi = "10.1140/epjb/e2012-30593-0",

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T1 - Wannier excitons signalling strong Coulomb coupling in graphene

AU - Grönqvist, Johanna

AU - Stroucken, T.

AU - Lindberg, Markus

AU - Koch, S.W.

PY - 2012

Y1 - 2012

N2 - 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.

AB - 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.

KW - graphene

KW - exciton

KW - many-body theory

U2 - 10.1140/epjb/e2012-30593-0

DO - 10.1140/epjb/e2012-30593-0

M3 - Article

SN - 1434-6028

VL - 85

JO - European Physical Journal B: Condensed Matter and Complex Systems

JF - European Physical Journal B: Condensed Matter and Complex Systems

IS - 395

ER -

Wannier excitons signalling strong Coulomb coupling in graphene

Abstract

Keywords

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