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Intrinsically interacting topological crystalline insulators and superconductors

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arxiv 1810.12317 v1 pith:D3BJIHRH submitted 2018-10-29 cond-mat.str-el

Alex Rasmussen , Yuan-Ming Lu This is my paper · ORCID
classification cond-mat.str-el
keywords crystallineinteractingphasestcistopologicalinsulatorsintrinsicallyprotected
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Motivated by recent progress in crystalline symmetry protected topological (SPT) phases of interacting bosons, we study topological crystalline insulators/superconductors (TCIs) of strongly interacting fermions. We construct a class of intrinsically interacting fermionic TCIs, and show that they are beyond both free-fermion TCIs and bosonic crystalline SPT phases. We also show how these phases can be characterized by symmetry protected gapless fermion modes on the corners/hinges of an open system.

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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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