Session P37: Focus Session: Graphene Structure, Dopants, and Defects: Strain Engineering II

8:00 AM–11:00 AM, Wednesday, March 23, 2011
Room: C146

Sponsoring Unit: DMP
Chair: Michael Crommie, University of California, Berkeley

Abstract ID: BAPS.2011.MAR.P37.4

Abstract: P37.00004 : Electronic states of graphene grain boundaries

9:00 AM–9:12 AM

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Authors:

  Andrej Mesaros
    (Instituut-Lorentz, Universiteit Leiden, P.O. Box 9506, 2300 RA Leiden, The Netherlands)

  Stefanos Papanikolaou
    (LASSP, Physics Department, Clark Hall, Cornell University, Ithaca, NY 14853-2501)

  C.F.J. Flipse
    (Department of Applied Physics, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands)

  Darius Sadri
    (Instituut-Lorentz, Universiteit Leiden, P.O. Box 9506, 2300 RA Leiden, The Netherlands)

  Jan Zaanen
    (Instituut-Lorentz, Universiteit Leiden, P.O. Box 9506, 2300 RA Leiden, The Netherlands)

Recent scanning tunneling spectroscopy measurements on graphite grain boundaries have identified zero energy peaks in the local density of states. These features are tied to intriguing magnetic properties observed in such samples, but are not found in existing theoretical models. We therefore study amorphous grain boundaries in graphene, and find stable structures along the boundary, responsible for local density of states enhancements both at zero and finite energies. We also consider the low energy continuum theory of arrays of dislocations forming a grain boundary in graphene. It predicts the appearance of localized zero energy states, pending the atomic scale dislocation core structure. We discuss possible stable dislocation core structures that actually carry such states.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.P37.4