Domain Growth in Long-range Ising Models with Disorder

Abstract

Recent advances have highlighted the rich low-temperature kinetics of the long-range Ising model (LRIM). This study investigates domain growth in an LRIM with quenched disorder, following a deep low-temperature quench. Specifically, we consider an Ising model with interactions that decay as $J(r)\sim r^{-(D+\ddot{I}ƒ)}$, where $D$ is the spatial dimension and $\ddot{I}ƒ>0$ is the power-law exponent. The quenched disorder is introduced via random pinning fields at each lattice site. For nearest-neighbor models, we expect that domain growth during activated dynamics is logarithmic in nature: $R(t)\sim (\ln t{)}^{\hat{I}}\pm$, with growth exponent $\hat{I}\pm >0$. Here, we examine how long-range interactions influence domain growth with disorder in dimensions $D=1$ and $D=2$. In $D=1$, logarithmic growth is found to persist for various $\ddot{I}ƒ>0$. However, in $D=2$, the dynamics is more complex due to the non-trivial interplay between extended interactions, disorder, and thermal fluctuations.

33 pages, 15 figures