Abstract
We study the asymptotic behavior of dilute spin lattice energies by exhibiting a continuous interfacial limit energy computed using the notion of Γ-convergence and techniques mixing Geometric Measure Theory and Percolation while scaling to zero the lattice spacing. The limit is not trivial above a percolation threshold. Since the lattice energies are not equi-coercive, a suitable notion of limit magnetization must be defined, which can be characterized by two phases separated by an interface. The macroscopic surface tension at this interface is characterized through a first-passage percolation formula, which highlights interesting connections between variational problems and percolation issues. A companion result on the asymptotic description on energies defined on paths in a dilute environment is also given.
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Braides, A., Piatnitski, A. Variational Problems with Percolation: Dilute Spin Systems at Zero Temperature. J Stat Phys 149, 846–864 (2012). https://doi.org/10.1007/s10955-012-0628-1
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DOI: https://doi.org/10.1007/s10955-012-0628-1