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Scaling limit and cube-root fluctuations in SOS surfaces above a wall | | Pietro Caputo
; Eyal Lubetzky
; Fabio Martinelli
; Allan Sly
; Fabio Lucio Toninelli
; | | Date: |
27 Feb 2013 | | Abstract: | Consider the classical $(2+1)$-dimensional Solid-On-Solid model above a hard
wall on an $L imes L$ box of $bZ^2$. 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 $exp(-eta mathcal{H}(eta))$, where $eta$ 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 the height of almost all
sites is concentrated on two levels, $H(L)=lfloor (1/4eta)log L
floor$ 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 $(H(L),H(L)-1,...)$. 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 $(1/4eta)log L_k$
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. | | Source: | arXiv, 1302.6941 | | Services: | Forum | Review | PDF | Favorites | |
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