arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1001.3563cond-mat.stat-mech
收藏

对排斥过程中的粒子凝聚

Particle Condensation in Pair Exclusion Process

Sang-Woo Kim, Joongul Lee, Jae Dong Noh

摘要:

冷凝的特征在于单个宏观冷凝物,其质量与系统尺寸$N$成比例。我们展示了粒子相互作用在凝聚现象中的重要性。我们研究了一个修改后的版本的零程过程,包括一对排斥。每个粒子都与自己的伙伴相关联,一对粒子被禁止停留在同一位置。对排斥是弱的,因为一个粒子只与所有其他粒子中的一个相互作用。事实证明,这样的弱相互作用极大地改变了凝聚的性质。出现了许多介观凝聚体:凝聚体的质量标度为$m_{\rm con}\sim N^{1/2}$,凝聚体的数量标度为$N_{\rm con} \sim N^{1/2}$,并进行对数校正。在一定的假设下,通过映射到一个可解模型,解析地导出了这些结果,并在数值上得到了证实。

英文摘要:

Condensation is characterized with a single macroscopic condensate whose mass is proportional to a system size $N$. We demonstrate how important particle interactions are in condensation phenomena. We study a modified version of the zero-range process by including a pair exclusion. Each particle is associated with its own partner, and particles of a pair are forbidden to stay at the same site. The pair exclusion is weak in that a particle interacts with only a single one among all others. It turns out that such a weak interaction changes the nature of condensation drastically. There appear a number of mesoscopic condensates: the mass of a condensate scales as $m_{\rm con}\sim N^{1/2}$ and the number of condensates scales as $N_{\rm con} \sim N^{1/2}$ with a logarithmic correction. These results are derived analytically through a mapping to a solvable model under a certain assumption, and confirmed numerically.

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。

↑