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Classification and surface anomaly of glide symmetry protected topological phases in three dimensions

机译:滑移对称性保护拓扑阶段的三维分类和表面异常

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摘要

We study glide protected topological (GSPT) phases of interacting bosons and fermions in three spatial dimensions with certain on-site symmetries. They are crystalline SPT phases, which are distinguished from a trivial product state only in the presence of non-symmorphic glide symmetry. We classify these GSPT phases with various on-site symmetries such as U(1) and time reversal, and show that they can all be understood by stacking and coupling two-dimensional (2D) short-range-entangled phases in a glide-invariant way. Using such a coupled layer construction we study the anomalous surface topological orders of these GSPT phases, which gap out the 2D surface states without breaking any symmetries. While this framework can be applied to any non-symmorphic SPT phase, we demonstrate it in many examples of GSPT phases including the non-symmorphic topological insulator with 'hourglass fermion' surface states.
机译:我们研究了具有一定现场对称性的三个空间维度上相互作用的玻色子和费米子的滑行保护拓扑(GSPT)相。它们是结晶的SPT相,只有在非对称滑翔对称的情况下才与琐碎的乘积状态区分开。我们使用各种现场对称性(例如U(1)和时间反转)对这些GSPT相进行分类,并显示可以通过将二维(2D)短程纠缠相堆叠并耦合成滑移不变来理解它们方式。使用这种耦合层构造,我们研究了这些GSPT相的异常表面拓扑顺序,这些顺序使2D表面状态保持一致,而不会破坏任何对称性。尽管此框架可以应用于任何非对称SPT相,但我们在GSPT相的许多示例中进行了演示,包括具有“沙漏费米子”表面状态的非对称拓扑绝缘体。

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