“School of Physics”
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| Paper IPM / P / 11243 |
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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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