Intermittency of height fluctuations in stationary state of the Kardar-Parisi-Zhang equation with infinitesimal surface tension in 1+1 dimensions

• Published in: Physical review. E, Statistical, nonlinear, and soft matter physics Vol. 70; no. 3 Pt 1; p. 031101
• Main Authors: Tabei, S M A, Bahraminasab, A, Masoudi, A A, Mousavi, S S, Reza Rahimi Tabar, M
• Format: Journal Article
• Language: English
• Published: United States 01.09.2004
• ISSN: 1539-3755; 1550-2376
• DOI: 10.1103/PhysRevE.70.031101

The Kardar-Parisi-Zhang (KPZ) equation with infinitesimal surface tension, dynamically develops sharply connected valley structures within which the height derivative is not continuous. We discuss the intermittency issue in the problem of stationary state forced KPZ equation in 1+1 dimensions. It is proved that the moments of height increments C(a) = <|h(x(1)) - h(x(2))|(a)> behave as |x(1) - x(2)|(xi(a)) with xi(a) = a for length scales |x(1) - x(2)|<<sigma . The length scale sigma is the characteristic length of the forcing term. We have checked the analytical results by direct numerical simulation.