自旋-1 Motzkin 链对于任何面积权重 $t<1$ 都是有能隙的
The spin-one Motzkin chain is gapped for any area weight $t<1$
AI总结:
通过高度控制的不平衡 Motzkin 行走近似描述有限开 Motzkin 链的基态,证明了自旋-1 Motzkin 链在 $t<1$ 时存在均匀谱隙、小 $t$ 时弦序参数非零以及 $t>1$ 时无能隙性对硬边界条件的鲁棒性。
摘要:
我们考虑具有面积权重 $t>0$ 的自旋-1 Motzkin 链。我们解决了文献中关于该模型的三个问题。我们证明了 (i) 对于所有 $t<1$ 存在均匀谱隙,正如 Zhang--Ahmadein--Klich \cite{zhang2017novel} 所猜想的那样;(ii) 弦序参数长距离极限的显式公式,表明它在小 $t$ 时非零,证实了 Barbiero 等人 \cite{barbiero2017haldane} 的猜想;(iii) $t>1$ 时的无能隙性是鲁棒的,并扩展到硬边界条件,回答了 Zhang--Klich \cite{zhang2017entropy} 的问题。这些结论基于有限开 Motzkin 链基态的有效近似描述,该描述采用高度控制的不平衡 Motzkin 行走。
英文摘要:
We consider the spin-one Motzkin chain with area weight $t>0$. We resolve three questions from the literature about this model. We prove (i) existence of a uniform spectral gap for all $t<1$ as conjectured by Zhang--Ahmadein--Klich \cite{zhang2017novel} (ii) an explicit formula for the long-distance limit of the string order parameter, which implies it is non-vanishing at small $t$, confirming a conjecture by Barbiero et al. \cite{barbiero2017haldane}, and (iii) that gaplessness for $t>1$ is robust and extends to hard boundary conditions, answering a question of Zhang--Klich \cite{zhang2017entropy}. These conclusions rest on an effective approximate description of the ground states of finite open Motzkin chains in terms of height-controlled imbalanced Motzkin walks.
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