Work

Non-Gaussian normal diffusion induced by delocalization

Year: 2016

Type: article

Abstract: Non-Gaussian normal diffusion, i.e., the probability density function (PDF) is non-Gaussian but the mean squared displacement (MSD) depends on time linearly, has been observed in particle motions. Here we show by numerical simulations that this phenomenon may manifest itself in energy diffusion along a lattice at a nonzero, finite temperature. The studied model is a one-dimensional disordered lattice with on-site potential. We find that the energy density fluctuations are spatially localized if the nonlinear interaction is suppressed, but may spread with a non-Gaussian PDF and a linear time-dependent MSD when the nonlinear interaction is turned on. Our analysis suggests that the mechanism lies in the delocalization properties of the localized modes.

Source: Physical review. E

DOI: 10.1103/physreve.93.032144

Authors: Jianjin Wang, Yong Zhang, Hong Zhao

Institutions: Xiamen University, Collaborative Innovation Center of Chemistry for Energy Materials

Language: English

Topic: Random lasers and scattering media

Subfield: Acoustics and Ultrasonics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funder: National Natural Science Foundation of China

Awards: 低维系统中的输运和扩散行为研究, 一维纳米材料中声子相互作用机制的理论研究