Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2007-09-11
Phys. Rev. B 74, 035418 (2006)
Physics
Condensed Matter
Statistical Mechanics
10 pages, 7 figures
Scientific paper
10.1103/PhysRevB.74.035418
We obtain the dynamic correlation function of two-dimensional lattice gas with nearest-neighbor repulsion in ordered c(2$\times$2) phase (antiferromagnetic ordering) under the condition of low concentration of structural defects. It is shown that displacements of defects of the ordered state are responsible for the particle number fluctuations in the probe area. The corresponding set of kinetic equations is derived and solved in linear approximation on the defect concentration. Three types of strongly correlated complex jumps are considered and their contribution to fluctuations is analysed. These are jumps of excess particles, vacancies and flip-flop jumps. The kinetic approach is more general than the one based on diffusion-like equations used in our previous papers. Thus, it becomes possible to adequately describe correlations of fluctuations at small times, where our previous theory fails to give correct results. Our new analytical results for fluctuations of particle number in the probe area agree well with those obtained by Monte Carlo simulations.
Argyrakis Panos
Chumak O. O.
Maragakis Michail
Zhugayevych Andriy
No associations
LandOfFree
Dynamic correlations in an ordered c(2$\times$2) lattice gas does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Dynamic correlations in an ordered c(2$\times$2) lattice gas, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dynamic correlations in an ordered c(2$\times$2) lattice gas will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-392523