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arXiv 2209.06182cond-mat.stat-mechhep-thmath-phmath.MP
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交错顶点模型的可积边界条件

Integrable boundary conditions for staggered vertex models

Holger Frahm, Sascha Gehrmann

摘要:

具有一般$\mathbb{Z}_2$ -交错的Yang-Baxter可积顶点模型可以用由初等$R$ -矩阵给出的复合$\mathbb{R}$ -矩阵表示.类似地,可积开边界条件可以通过基于这些对象的广义反射代数和它们的复合边界矩阵$\mathbb{K}^\pm$的表示来构造。我们表明,只有两种类型的交错产生一个本地的可积开边界条件的哈密顿量在这种方法。底层模型中的交错允许第二层次的对易运动积分(除了包括从通常的传递矩阵获得的哈密顿量的积分之外),从所谓的准动量算子开始。在本文中,我们表明,这个准动量算子可以得到与哈密顿周期和开放的模型在一个统一的方式从扩大杨巴克斯特或反射代数的复合图片。对于交错六顶点模型的特殊情况,这允许在两个局部情况之间构造可积谱流。

英文摘要:

Yang-Baxter integrable vertex models with a generic $\mathbb{Z}_2$-staggering can be expressed in terms of composite $\mathbb{R}$-matrices given in terms of the elementary $R$-matrices. Similarly, integrable open boundary conditions can be constructed through generalized reflection algebras based on these objects and their representations in terms of composite boundary matrices $\mathbb{K}^\pm$. We show that only two types of staggering yield a local Hamiltonian with integrable open boundary conditions in this approach. The staggering in the underlying model allows for a second hierarchy of commuting integrals of motion (in addition to the one including the Hamiltonian obtained from the usual transfer matrix), starting with the so-called quasi momentum operator. In this paper, we show that this quasi momentum operator can be obtained together with the Hamiltonian for both periodic and open models in a unified way from enlarged Yang-Baxter or reflection algebras in the composite picture. For the special case of the staggered six-vertex model, this allows constructing an integrable spectral flow between the two local cases.

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