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arXiv 2202.01231cond-mat.str-elcond-mat.supr-con
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相互作用使能的分形高阶拓扑相

Interaction Enabled Fractonic Higher-Order Topological Phases

Julian May-Mann, Yizhi You, Taylor L. Hughes, Zhen Bi

摘要:

在这项工作中,我们提出了一个集合的三维高阶对称性保护拓扑相位(HOSPTs)与无间隙铰链模式,只存在于强相互作用系统的子系统对称性约束。我们使用一个耦合线建设产生三个家庭的微观晶格模型:绝缘体与螺旋铰链模式,超导体与手性马约拉纳铰链模式,和分数绝缘体与螺旋铰链模式,携带分数电荷。特别是,这些HOSPT不需要空间对称性保护,而是由子系统对称性保护,并支持仅在系统的低维子流形内移动的“分形”准粒子激发。我们分析了边界理论和纠缠哈密顿量的异常结构,并表明,这些HOSPT的侧表面,尽管部分间隙,表现出对称性异常,只能实现为三维HOSPT相位的边界。

英文摘要:

In this work, we present a collection of three-dimensional higher-order symmetry protected topological phases (HOSPTs) with gapless hinge modes that exist only in strongly interacting systems subject to subsystem symmetry constraints. We use a coupled wire construction to generate three families of microscopic lattice models: insulators with helical hinge modes, superconductors with chiral Majorana hinge modes, and fractionalized insulators with helical hinge modes that carry fractional charge. In particular, these HOSPTs do not require spatial symmetry protection, but are instead protected by subsystem symmetries, and support "fractonic" quasiparticle excitations that move within only a low-dimensional sub-manifold of the system. We analyze the anomaly structure for the boundary theory and the entanglement Hamiltonian, and show that the side surfaces of these HOSPTs, despite being partially gapped, exhibit symmetry anomalies, and can only be realized as the boundary of three-dimensional HOSPT phases.

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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