×

Scaling limit and cube-root fluctuations in SOS surfaces above a wall. (English) Zbl 1344.60091

Summary: Consider the classical \((2+1)\)-dimensional solid-on-solid model above a hard wall on an \(L \times L\) box of \(\mathbb Z^2\). The model describes a crystal surface by assigning a non-negative integer height \(\eta_x\) to each site \(x\) in the box and 0 heights to its boundary. The probability of a surface configuration \(\eta\) is proportional to \(\exp(-\beta \mathcal{H}(\eta))\), where \(\beta\) is the inverse-temperature and \(\mathcal{H}(\eta)\) sums the absolute values of height differences between neighboring sites.
We give a full description of the shape of the SOS surface for low enough temperatures. First we show that with high probability (w.h.p.) the height of almost all sites is concentrated on two levels, \(H(L) = \lfloor (1/4\beta)\log L \rfloor\) and \(H(L)-1\). Moreover, for most values of \(L\) the height is concentrated on the single value \(H(L)\). Next, we study the ensemble of level lines corresponding to the heights \((H(L),H(L)-1,\ldots)\). We prove that w.h.p.there is a unique macroscopic level line for each height. Furthermore, when taking a diverging sequence of system sizes \(L_k\), the rescaled macroscopic level line at height \(H(L_k)-n\) has a limiting shape if the fractional parts of \((1/4\beta)\log L_k\) converge to a noncritical value. The scaling limit is an explicit convex subset of the unit square \(Q\) and its boundary has a flat component on the boundary of \(Q\). Finally, the highest macroscopic level line has \(L_k^{1/3+o(1)}\) fluctuations along the flat part of the boundary of its limiting shape.

MSC:

60K35 Interacting random processes; statistical mechanics type models; percolation theory
60F17 Functional limit theorems; invariance principles
82C24 Interface problems; diffusion-limited aggregation in time-dependent statistical mechanics
82B41 Random walks, random surfaces, lattice animals, etc. in equilibrium statistical mechanics
PDFBibTeX XMLCite
Full Text: DOI arXiv

References:

This reference list is based on information provided by the publisher or from digital mathematics libraries. Its items are heuristically matched to zbMATH identifiers and may contain data conversion errors. In some cases that data have been complemented/enhanced by data from zbMATH Open. This attempts to reflect the references listed in the original paper as accurately as possible without claiming completeness or a perfect matching.