We use a constant “driving force”F d together with a Gaussian thermostatting “constraint force”F d to simulate a nonequilibrium steady-state current (particle velocity) in a periodic, two-dimensional, classical Lorentz gas. The ratio of the average particle velocity to the driving force (field strength) is the Lorentz-gas conductivity. A regular “Galton-board” lattice of fixed particles is arranged in a dense triangular-lattice structure. The moving scatterer particle travels through the lattice at constant kinetic energy, making elastic hard-disk collisions with the fixed particles. At low field strengths the nonequilibrium conductivity is statistically indistinguishable from the equilibrium Green-Kubo estimate of Machta and Zwanzig. The low-field conductivity varies smoothly, but in a complicated way, with field strength. For moderate fields the conductivity generally decreases nearly linearly with field, but is nearly discontinuous at certain values where interesting stable cycles of collisions occur. As the field is increased, the phase-space probability density drops in apparent fractal dimensionality from 3 to 1. We compare the nonlinear conductivity with similar zero-density results from the two-particle Boltzmann equation. We also tabulate the variation of the kinetic pressure as a function of the field strength,
This is a preview of subscription content, log in to check access.
Buy single article
Instant access to the full article PDF.
Price includes VAT for USA
Subscribe to journal
Immediate online access to all issues from 2019. Subscription will auto renew annually.
This is the net price. Taxes to be calculated in checkout.
M. Kac,Sci. Am. 211(9):92 (1964).
W. G. Hoover,Molecular Dynamics (Springer-Verlag, Heidelberg, 1986).
S. Nosé,J. Chem. Phys. 81:511 (1984);Mol. Phys. 52:255 (1984).
H. A. Posch, W. G. Hoover, and F. J. Vesely,Phys. Rev. A 33:4253 (1986).
J. Machta and R. W. Zwanzig,Phys. Rev. Lett. 50:1959 (1983).
W. G. Hoover,J. Stat. Phys. 42:587 (1986).
G. P. Morriss,Phys. Lett. 113A:269 (1985).
W. G. Hoover and K. W. Kratky,J. Stat. Phys. 42:1103 (1986).
K. W. Kratky and W. G. Hoover,J. Stat. Phys., to appear (1987).
J. D. Farmer, E. Ott, and J. A. Yorke,Physica 7D:153 (1983).
B. B. Mandelbrot,The Fractal Geometry of Nature (W. H. Freeman, San Francisco, 1982).
W. G. Hoover and H. A. Posch,Phys. Lett. 113A:82 (1985).
W. G. Hoover, H. A. Posch, B. L. Holian, and S. Bestiale,Bull. Amer. Phys. Soc. 32:824 (1987).
W. G. Hoover,Physica 118:111 (1983).
A. Einstein,Z. Phys. Chem. 18:121 (1917).
W. G. Hoover, B. Moran, B. Holian, H. Posch, and S. Bestiale, in Proceedings of the 5th Topical Conference on Shock Waves in Condensed Matter, Monterey, California, July 1987,Bull. Am. Phys. Soc. 32:1370 (1987).
About this article
Cite this article
Moran, B., Hoover, W.G. & Bestiale, S. Diffusion in a periodic Lorentz gas. J Stat Phys 48, 709–726 (1987). https://doi.org/10.1007/BF01019693
- Gaussian thermostat
- periodic Lorentz gas
- hard disks