Kink dynamics in a one-dimensional growing surface
| dc.creator | Politi, Paolo | |
| dc.date | 1998-03-05 | |
| dc.date | 1998-04-10 | |
| dc.date.accessioned | 2026-07-07T06:24:04Z | |
| dc.date.available | 2026-07-07T06:24:04Z | |
| dc.description | A high-symmetry crystal surface may undergo a kinetic instability during the growth, such that its late stage evolution resembles a phase separation process. This parallel is rigorous in one dimension, if the conserved surface current is derivable from a free energy. We study the problem in presence of a physically relevant term breaking the up-down symmetry of the surface and which can not be derived from a free energy. Following the treatment introduced by Kawasaki and Ohta [Physica 116A, 573 (1982)] for the symmetric case, we are able to translate the problem of the surface evolution into a problem of nonlinear dynamics of kinks (domain walls). Because of the break of symmetry, two different classes ($A$ and $B$) of kinks appear and their analytical form is derived. The effect of the adding term is to shrink a kink $A$ and to widen the neighbouring kink $B$, in such a way that the product of their widths keeps constant. Concerning the dynamics, this implies that kinks $A$ move much faster than kinks $B$. Since the kink profiles approach exponentially the asymptotical values, the time dependence of the average distance $L(t)$ between kinks does not change: $L(t)\sim\ln t$ in absence of noise, and $L(t)\sim t^{1/3}$ in presence of (shot) noise. However, the cross-over time between the first and the second regime may increase even of some orders of magnitude. Finally, our results show that kinks $A$ may be so narrow that their width is comparable to the lattice constant: in this case, they indeed represent a discontinuity of the surface slope, that is an angular point, and a different approach to coarsening should be used. | |
| dc.description | Revtex file, 14 pages, no figure. Revised version with minor corrections. To be published in Phys. Rev. E | |
| dc.identifier | https://arxiv.org/abs/cond-mat/9803063 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/9803063 | |
| dc.identifier | Phys. Rev. E 58, 281-294 (1998) | |
| dc.identifier | doi:10.1103/PhysRevE.58.281 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/96419 | |
| dc.subject | Statistical Mechanics | |
| dc.title | Kink dynamics in a one-dimensional growing surface | |
| dc.type | text |