Lattice drumhead model

Abstract
The drumhead model describing the interface separating two coexisting phases is analyzed on a lattice. A strong-coupling transformation allows asymptotic results for the interface fluctuations in the limit of weak pinning to be extracted. The model exhibits roughness for bulk d3. An exact solution for the free energy in bulk d=2 has been obtained. Comparison with work of Buff, Lovett, and Stillinger and of Wallace and Zia is made.