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Local defects and ferromagnetism in graphene layers

M. A. H. Vozmediano, M. P. López-Sancho, T. Stauber, and F. Guinea
Phys. Rev. B 72, 155121 – Published 28 October 2005
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  • INTRODUCTION
  • THE MODEL
  • BOUND STATES NEAR CRACKS AND OTHER…
  • ELECTRON ELECTRON INTERACTIONS
  • COUPLING BETWEEN LOCAL MOMENTS
  • CONCLUSIONS
  • ACKNOWLEDGEMENTS
    • References

    Abstract

    We study the changes in the electronic structure induced by lattice defects in graphene planes. In many cases, lattice distortions give rise to localized states at the Fermi level. Electron-electron interactions lead to the existence of local moments. The RKKY interaction between these moments is always ferromagnetic, due to the semimetallic properties of graphene.

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    • Received 29 June 2005

    DOI:https://doi.org/10.1103/PhysRevB.72.155121

    ©2005 American Physical Society

    Authors & Affiliations

    M. A. H. Vozmediano1, M. P. López-Sancho2, T. Stauber2, and F. Guinea2,3

    • 1Unidad Asociada CSIC-UC3M, Universidad Carlos III de Madrid, E-28911 Leganés, Madrid, Spain
    • 2Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, E-28049 Madrid, Spain
    • 3Department of Physics, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, USA

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    Issue

    Vol. 72, Iss. 15 — 15 October 2005

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    Images

    • Figure 1
      Figure 1
      (Color online) Elongated crack in the honeycomb structure. The crack is such that the sites in the upper edge belong to one sublattice, while those at the lower edge belong to the other. Bottom: an approximate cut in the complex plane that can be used to represent this crack at long distances.Reuse & Permissions
    • Figure 2
      Figure 2
      (Color online) Energy of the five states with positive energy closest to ϵ=0 for a cluster of size L×L that contains at the center the defect shown in the inset. Periodic boundary conditions are used. The spectrum is symmetric around ϵ=0.Reuse & Permissions
    • Figure 3
      Figure 3
      Density of states of a 24×24 cluster with a large defect as the one shown in Fig. 1. The on-site interaction term is U=0.Reuse & Permissions
    • Figure 4
      Figure 4
      The same as Fig. 3 with an on-site interaction U=0.5t.Reuse & Permissions
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