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arXiv 1005.4297cond-mat.stat-mechcond-mat.soft
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三维Ising格子气中的横向驱动界面

Laterally driven interfaces in the three-dimensional Ising lattice gas

Thomas H. R. Smith, Oleg Vasilyev, Anna Maciołek, Matthias Schmidt

摘要:

我们利用川崎动力学的计算机模拟研究了三维空间中相分离驱动的伊辛格子气的稳态。一个外力场F(z)作用在平行于界面的x方向上,产生一个横向序参量电流j^x(z),它随离界面的距离z而变化。以上的粗糙化温度,我们的数据为“剪切”的线性变化的F(z)是在协议的图片,其中剪切作为有效的限制在这个系统中,从而抑制界面毛细波波动。我们发现更尖锐的磁化曲线和减少的界面宽度相比,平衡。对相关性在涡度方向y上比在驱动方向上受到更多的抑制;结构因子则相反。毛细波的横向输运发生在F(z)的那些形式中,对于这些形式,电流j^x(z)是z的奇函数,例如剪切驱动和“阶梯状”驱动场。对于一个V形的驱动力没有这样的运动发生,但毛细波抑制更强烈比剪切驱动。这些发现与我们以前的二维模拟研究一致。接近和低于(平衡)粗糙化温度的有效约束图片停止工作,但界面的横向运动持续存在。

英文摘要:

We study the steady state of a phase-separated driven Ising lattice gas in three dimensions using computer simulations with Kawasaki dynamics. An external force field F(z) acts in the x direction parallel to the interface, creating a lateral order parameter current j^x(z) which varies with distance z from the interface. Above the roughening temperature, our data for `shear-like' linear variation of F(z) are in agreement with the picture wherein shear acts as effective confinement in this system, thus supressing the interfacial capillary-wave fluctuations. We find sharper magnetisation profiles and reduced interfacial width as compared to equilibrium. Pair correlations are more suppressed in the vorticity direction y than in the driving direction; the opposite holds for the structure factor. Lateral transport of capillary waves occurs for those forms of F(z) for which the current j^x(z) is an odd function of z, for example the shear-like drive, and a `step-like' driving field. For a V-shaped driving force no such motion occurs, but capillary waves are suppressed more strongly than for the shear-like drive. These findings are in agreement with our previous simulation studies in two dimensions. Near and below the (equilibrium) roughening temperature the effective-confinement picture ceases to work, but the lateral motion of the interface persists.

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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