Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2011-10-31
Phys. Rev. E 84, 061150 (2011)
Physics
Condensed Matter
Statistical Mechanics
7 pages, 8 figures, slightly modified, accepted version for PRE
Scientific paper
10.1103/PhysRevE.84.061150
The octahedron model introduced recently has been implemented onto graphics cards, which permits extremely large scale simulations via binary lattice gases and bit coded algorithms. We confirm scaling behaviour belonging to the 2d Kardar-Parisi-Zhang universality class and find a surface growth exponent: beta=0.2415(15) on 2^17 x 2^17 systems, ruling out beta=1/4 suggested by field theory. The maximum speed-up with respect to a single CPU is 240. The steady state has been analysed by finite size scaling and a growth exponent alpha=0.393(4) is found. Correction to scaling exponents are computed and the power-spectrum density of the steady state is determined. We calculate the universal scaling functions, cumulants and show that the limit distribution can be obtained by the sizes considered. We provide numerical fitting for the small and large tail behaviour of the steady state scaling function of the interface width.
Kelling Jeffrey
Odor Geza
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