Calculus of Variations and Geometric Measure Theory
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E. Davoli - P. Piovano - U. Stefanelli

Wulff shape emergence in graphene

created by davoli on 22 Jan 2016
modified by piovano on 28 Aug 2016

[BibTeX]

Accepted Paper

Inserted: 22 jan 2016
Last Updated: 28 aug 2016

Journal: Math. Models Methods Appl. Sci.
Year: 2016

Abstract:

Graphene samples are identified as minimizers of configurational energies featuring both two- and three-body atomic-interaction terms. This variational viewpoint allows for a detailed description of ground-state geometries as connected subsets of a regular hexagonal lattice. We investigate here how these geometries evolve as the number $n$ of carbon atoms in the graphene sample increases. By means of an equivalent characterization of minimality via a discrete isoperimetric inequality, we prove that ground states converge to the ideal hexagonal Wulff shape as $n\to+\infty$. Precisely, ground states deviate from such hexagonal Wulff shape by at most $K n^{3/4} + o(n^{3/4})$ atoms, where both the constant $K$ and the rate $n^{3/4}$ are sharp.


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