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arXiv 2305.03398cond-mat.str-elcond-mat.stat-mechhep-thmath-phmath.MPquant-ph
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对称性保护的拓扑相、共形临界性与可精确求解SO($n$)自旋链中的对偶性

Symmetry-protected topological phases, conformal criticalities, and duality in exactly solvable SO($n$) spin chains

Sreejith Chulliparambil, Hua-Chen Zhang, Hong-Hao Tu

AI总结:

我们引入一族可精确求解的SO($n$)对称自旋链,推广横场伊辛链,通过马约拉纳费米子映射求解,发现临界点由Spin($n$)$_1$共形场论描述,并证明两个有能隙相通过Kramers-Wannier对偶关联,其中一个为对称性保护的拓扑相。

摘要:

我们引入了一族SO($n$)对称的自旋链,该族自旋链在$n=1$时推广了横场伊辛链。这些自旋链用Gamma矩阵定义,并可通过映射到耦合到静态$\mathbb{Z}_2$规范场的$n$种巡回马约拉纳费米子来精确求解。它们的相图包括一个由$\mathrm{Spin}(n)_{1}$共形场论描述的临界点以及两个不同的有能隙相。我们证明其中一个有能隙相是平凡相,另一个在$n \geq 2$时实现对称性保护的拓扑相。这两个有能隙相被证明通过Kramers-Wannier对偶性相互关联。此外,横场伊辛链中的其他优雅结构,如无限维Onsager代数,也适用于我们的模型。

英文摘要:

We introduce a family of SO($n$)-symmetric spin chains which generalize the transverse-field Ising chain for $n=1$. These spin chains are defined with Gamma matrices and can be exactly solved by mapping to $n$ species of itinerant Majorana fermions coupled to a static $\mathbb{Z}_2$ gauge field. Their phase diagrams include a critical point described by the $\mathrm{Spin}(n)_{1}$ conformal field theory as well as two distinct gapped phases. We show that one of the gapped phases is a trivial phase and the other realizes a symmetry-protected topological phase when $n \geq 2$. These two gapped phases are proved to be related to each other by a Kramers-Wannier duality. Furthermore, other elegant structures in the transverse-field Ising chain, such as the infinite-dimensional Onsager algebra, also carry over to our models.

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。

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