论文标题

用淬灭拓扑的晶格聚合物的吸附

Adsorption of Lattice Polymers with Quenched Topologies

论文作者

Madras, Neal

论文摘要

我们引入了一个吸附单个聚合物的框架,其中与具有退火拓扑的更标准的吸附模型相反,在吸附之前将聚合物的拓扑结束。我们的“拓扑”是指分支聚合物的精确分支结构(任何维度),或者是指在三个维度上的环类型聚合物的结型。在四个类别之一(晶格动物,树木,梳子或环之一)中,从给定大小的所有晶格聚合物中随机选择了淬灭的拓扑结构,然后我们考虑吸附具有淬灭拓扑的构型子类。当聚合物表面吸引力增加而没有结合时,与退火模型相比,淬灭的拓扑结构将单体的宏观刻度保持在表面上,这些模型在地表中渐近地具有100%的单体。尽管仍然存在重要的开放问题,但我们证明了限制自由能的特性和每个模型中的关键点。我们特别注意梳子聚合物的类别,这些梳子聚合物承认对否则仍保持开放的问题的一些严格答案。由于所有梳子的类别以前并未完全全面检查,因此我们还证明了其生长常数的存在及其限制自由能以进行退火吸附。

We introduce a framework for adsorption of a single polymer in which the topology of the polymer is quenched before adsorption, in contrast to more standard adsorption models having annealed topology. Our "topology" refers either to the precise branching structure of a branched polymer (in any dimension), or else to the knot type of a ring polymer in three dimensions. The quenched topology is chosen uniformly at random from all lattice polymers of a given size in one of four classes (lattice animals, trees, combs, or rings), and we then consider adsorption of the subclass of configurations that have the quenched topology. When the polymer-surface attraction increases without bound, the quenched topological structure keeps a macroscopic fraction of monomers off the surface, in contrast with annealed models that asymptotically have 100% of monomers in the surface. We prove properties of the limiting free energy and the critical point in each model, although important open questions remain. We pay special attention to the class of comb polymers, which admit some rigorous answers to questions that otherwise remain open. Since the class of all combs was not previously examined rigorously in full generality, we also prove the existence of its growth constant and its limiting free energy for annealed adsorption.

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