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arXiv 1402.6669cond-mat.stat-mech
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局域驱动排斥过程中的长程关联

Long-range correlations in a locally driven exclusion process

Tridib Sadhu, Satya N. Majumdar, David Mukamel

摘要:

我们发现,在一个简单的排斥相互作用的扩散格子气中存在一个驱动键,导致在其定态下的长程密度-密度关联。在尺寸$d>1$,我们表明,在热力学极限,这种相关性衰减为$C(r,s)\sim (r^2+s^2)^{-d}$在大距离$r$和$s$远离驱动器与$|r-s|>>1$。这是使用静电类比导出的,其中$C(r,s)$表示为由于分布在$2d$维中的静电电荷的配置而产生的电势。在体积密度$ρ=1/2$,我们表明,潜在的是一个本地化的四极电荷。在其他密度下,在驱动力强度的领先顺序中,这一点也是正确的,并且在数值上被认为在更高的顺序中也是有效的。

英文摘要:

We show that the presence of a driven bond in an otherwise diffusive lattice gas with simple exclusion interaction results in long-range density-density correlation in its stationary state. In dimensions $d>1$ we show that in the thermodynamic limit this correlation decays as $C(r,s)\sim (r^2+s^2)^{-d}$ at large distances $r$ and $s$ away from the drive with $|r-s|>>1$. This is derived using an electrostatic analogy whereby $C(r,s)$ is expressed as the potential due to a configuration of electrostatic charges distributed in $2d$-dimension. At bulk density $ρ=1/2$ we show that the potential is that of a localized quadrupolar charge. At other densities the same is correct in leading order in the strength of the drive and is argued numerically to be valid at higher orders.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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