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Wannier excitons signalling strong Coulomb coupling in graphene

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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.

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Authors and Affiliations

  1. Department of Physics and Material Sciences Center, Philipps University Marburg, Renthof 5, 35032, Marburg, Germany

    J.H. Grönqvist, T. Stroucken & S.W. Koch

  2. Department of Physics, Åbo Akademi University, 20500, Turku, Finland

    J.H. Grönqvist & M. Lindberg

Authors
  1. J.H. Grönqvist
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  2. T. Stroucken
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  3. M. Lindberg
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  4. S.W. Koch
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Correspondence to J.H. Grönqvist.

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Grönqvist, J., Stroucken, T., Lindberg, M. et al. Wannier excitons signalling strong Coulomb coupling in graphene. Eur. Phys. J. B 85, 395 (2012). https://doi.org/10.1140/epjb/e2012-30593-0

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  • DOI: https://doi.org/10.1140/epjb/e2012-30593-0

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