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Higher-order bulk-boundary correspondence for topological crystalline phases

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arxiv 1805.02598 v2 pith:DF7UTYZB submitted 2018-05-07 cond-mat.mes-hall

classification cond-mat.mes-hall
keywords topologicalphasesboundarybulkbulk-boundarycorrespondencecrystallinehigher-order
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We study the bulk-boundary correspondence for topological crystalline phases, where the crystalline symmetry is an order-two (anti)symmetry, unitary or antiunitary. We obtain a formulation of the bulk-boundary correspondence in terms of a subgroup sequence of the bulk classifying groups, which uniquely determines the topological classification of the boundary states. This formulation naturally includes higher-order topological phases as well as topologically nontrivial bulk systems without topologically protected boundary states. The complete bulk and boundary classification of higher-order topological phases with an additional order-two symmetry or antisymmetry is contained in this work.

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  1. Higher-order topological phase without crystalline symmetry

    cond-mat.str-el 2019-08 conditional novelty 7.0 of 10

    Subsystem symmetries can protect gapless hinges and corners in interacting 3D models, yielding higher-order topological phases that require no crystalline symmetry.

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