Higher-Order Topological Insulators and Semimetals on the Breathing Kagome and Pyrochlore Lattices.


A second-order topological insulator in d dimensions is an insulator which has no d-1 dimensional topological boundary states but has d-2 dimensional topological boundary states. It is an extended notion of the conventional topological insulator. Higher-order topological insulators have been investigated in square and cubic lattices. In this Letter, we… (More)
DOI: 10.1103/PhysRevLett.120.026801

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