论文标题
耦合电线的分形拓扑阶段
Fractonic topological phases from coupled wires
论文作者
论文摘要
在三个维度中,间隙阶段可以支持“分形”准颗粒激发,这要么是完全不动的,要么只能在低维度亚策略范围内移动,这是一种特殊的拓扑现象,超出了拓扑量子场理论的常规框架。在这项工作中,我们使用三维耦合电线构建体探索了分形拓扑阶段,事实证明,这是实现和表征二维拓扑阶段的成功工具。我们发现,模型中都可以出现带有分裂激发的间隙和无间隙相。在张开的情况下,我们认为分数激发沿线方向是移动的,但是它们在横向平面中的迁移率通常会降低。我们表明,激发通常具有无限级融合结构,不同于先前已知的间隙分裂模型。像2D耦合的线构建体一样,许多模型都表现出无间隙(甚至手性)的表面状态,可以通过无限组分的Luttinger液体来描述。然而,表面理论的普遍性类别在很大程度上取决于表面方向,从而揭示了一种新型的散装 - 边界对应关系。
In three dimensions, gapped phases can support "fractonic" quasiparticle excitations, which are either completely immobile or can only move within a low-dimensional submanifold, a peculiar topological phenomenon going beyond the conventional framework of topological quantum field theory. In this work we explore fractonic topological phases using three-dimensional coupled wire constructions, which have proven to be a successful tool to realize and characterize topological phases in two dimensions. We find that both gapped and gapless phases with fractonic excitations can emerge from the models. In the gapped case, we argue that fractonic excitations are mobile along the wire direction, but their mobility in the transverse plane is generally reduced. We show that the excitations in general have infinite-order fusion structure, distinct from previously known gapped fracton models. Like the 2D coupled wire constructions, many models exhibit gapless (or even chiral) surface states, which can be described by infinite-component Luttinger liquids. However, the universality class of the surface theory strongly depends on the surface orientation, thus revealing a new type of bulk-boundary correspondence unique to fracton phases.