Thermal control of graphene morphology: a signature of its intrinsic surface tension
arXiv:1806.10065 · doi:10.1103/PhysRevB.97.235426
Abstract
The surface tension of free-standing graphene is studied by path-integral simulations as a function of the temperature and the in-plane stress. Even if the applied stress vanishes, the membrane displays a finite surface tension due to the coupling between the bending oscillations and the real area of the membrane. Zero-point effects for are significant below 100 K. Thermal cooling drives the membrane from a planar to a wrinkled morphology. Upon heating the change is reversible and shows hysteresis, in agreement to recent experiments performed on supported graphene.
7 pages, 5 figures
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