Phys. Rev. Lett. 54, 2026–2029 (1985)Excess Noise for Driven Diffusive SystemsReceived 2 January 1985; published in the issue dated 6 May 1985 We investigate the steady-state scattering function for driven diffusive systems with a single conserved density. In one dimension, density fluctuations spread as t2/3, i.e., faster than the diffusive t1/2, for large time t. The corresponding excess noise in the current-current correlation diverges as ω-1/3 for small frequency ω. Monte Carlo simulation results for a driven hard-core lattice gas confirm these results. d=2 is the borderline dimension with marginally nondiffusive behavior; for d>2, the spread is diffusive with anisotropic long-time-tail corrections. © 1985 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.54.2026
DOI:
10.1103/PhysRevLett.54.2026
PACS:
66.30.Dn, 05.60.+w, 72.70.+m
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