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arXiv 0709.1322cond-mat.stat-mech
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不同临界子系统间界面的标度特性:Ashkin-Teller模型

Scaling properties at the interface between different critical subsystems: The Ashkin-Teller model

Peter Lajko, Loic Turban, Ferenc Igloi

摘要:

考虑两个临界指数不同的临界半无限子系统,并通过它们的曲面将它们耦合起来。在界面处的临界行为,受到两个子系统的临界涨落的影响,可以是相当丰富的。为了研究各种可能性,我们研究了由两个耦合的Ashkin-Teller模型组成的系统,在结的两侧具有不同的四自旋耦合。通过改变介电常数,这两个子系统的一些体和表面临界指数不断修改,这反过来又改变了界面的临界行为。特别是,我们研究的边际情况下,在接口处的磁临界指数不断变化的相互作用参数的强度。通过DMRG计算检查缩放参数的预期行为。

英文摘要:

We consider two critical semi-infinite subsystems with different critical exponents and couple them through their surfaces. The critical behavior at the interface, influenced by the critical fluctuations of the two subsystems, can be quite rich. In order to examine the various possibilities, we study a system composed of two coupled Ashkin-Teller models with different four-spin couplings epsilon, on the two sides of the junction. By varying epsilon, some bulk and surface critical exponents of the two subsystems are continuously modified, which in turn changes the interface critical behavior. In particular we study the marginal situation, for which magnetic critical exponents at the interface vary continuously with the strength of the interaction parameter. The behavior expected from scaling arguments is checked by DMRG calculations.

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