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Paper   IPM / Physic / 11243
School of Physics
  Title:   Irreversibility in Response to Forces Acting on the Graphene Sheets
1.  N. Abedpour
2.  R. asgari
3.  M.R. Rahimi Tabar
  Status:   Published
  Journal: Phys. Rev. Lett.
  Vol.:  104
  Year:  2010
  Pages:   196804
  Supported by:  IPM
The amount of rippling in graphene sheets is related to the interactions with the substrate or with the suspending structure. Here, we report on an irreversibility in the response to forces that act on suspended graphene sheets. This may explain why one always observes a ripple structure on suspended graphene. We show that a compression-relaxation mechanism produces static ripples on graphene sheets and determine a peculiar temperature Tc, such that for T < Tc the free energy of the rippled graphene is smaller than that of roughened graphene. We also show that Tc depends on the structural parameters and increases with increasing sample size.

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