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- W2043111910 abstract "Rugged energy landscapes find wide applications in diverse fields ranging from astrophysics to protein folding. We study the dependence of diffusion coefficient (D) of a Brownian particle on the distribution width (ɛ) of randomness in a Gaussian random landscape by simulations and theoretical analysis. We first show that the elegant expression of Zwanzig [Proc. Natl. Acad. Sci. U.S.A. 85, 2029 (1988)] for D(ɛ) can be reproduced exactly by using the Rosenfeld diffusion-entropy scaling relation. Our simulations show that Zwanzig's expression overestimates D in an uncorrelated Gaussian random lattice - differing by almost an order of magnitude at moderately high ruggedness. The disparity originates from the presence of three-site traps (TST) on the landscape - which are formed by the presence of deep minima flanked by high barriers on either side. Using mean first passage time formalism, we derive a general expression for the effective diffusion coefficient in the presence of TST, that quantitatively reproduces the simulation results and which reduces to Zwanzig's form only in the limit of infinite spatial correlation. We construct a continuous Gaussian field with inherent correlation to establish the effect of spatial correlation on random walk. The presence of TSTs at large ruggedness (ɛ ≫ k(B)T) gives rise to an apparent breakdown of ergodicity of the type often encountered in glassy liquids." @default.
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- W2043111910 date "2014-09-23" @default.
- W2043111910 modified "2023-09-26" @default.
- W2043111910 title "Diffusion on a rugged energy landscape with spatial correlations" @default.
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- W2043111910 doi "https://doi.org/10.1063/1.4895905" @default.
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