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Structural Disorders of Graphene and Its Effects on Electronic Properties

Abedpour, Nima | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40512 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Rahimi Tabar, Mohammad Reza
  7. Abstract:
  8. In this thesis we would like to investigate structural disorder of Graphene and its effect on electronic properties. Graphene is a one-layer crystal of Carbon atoms which was the first two dimensional crystal observed experimentally. Low energy current carriers on Graphene behave like mass-less Dirac fermions and this interesting electronic property attracts much attention on studying Graphene. Structural disorder of Graphene highly affects its electronic properties. We study thermal fluctuations of Graphene sheet, disorder super lattice, and static ripples, as structural disorders of Graphene. Disorders due to thermal fluctuations of graphene induce a disordered gauge field on the graphene sheet. These disordered gauge fields won’t localize the electronic states of graphene. Graphene supper lattice which is a consequence of potential barriers and wells, behaves differently from the normal super lattices of semi conductors. With disorders on the width of barriers, at the thermodynamic limit, the electronic states become localized for all energies except in a spatial condition which the wave length of incident particles are equal to the width of the wells. In this condition we would have finite conductance. At last we investigate the static ripples of graphene as a type of thermal fluctuations of graphene sheet. Ripples affect the electronic properties of graphene like the other structural disorders. They are also one reason of suspended graphene’s stability. The wave length of ripples varies with temperature and is independent of the sample size. Indeed ripples are considered as an intrinsic property of graphene.
  9. Keywords:
  10. Graphine ; Disorder ; Localization ; Surface Roughness ; Gain Ripple

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