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• W3009141303 abstract "The robust quantization of observables in units of universal constants is a hallmark of topological phases. We show that chiral higher order topological insulators (HOTIs), bulk insulators with chiral hinge states, present two unusual features related to quantization. First, we show that circular dichroism is quantized to an integer or zero depending on the orientation of the sample. This probe locates the hinge states, and can be used to distinguish different types of chiral HOTIs. Second, we find that the average of the local Chern marker over a single surface, an observable related to the surface Hall conductivity known to be quantized in the infinite slab geometry, is nonuniversal for a finite surface. This is due to a nonuniversal contribution of the hinge states, previously unaccounted for, that distinguishes surfaces of chiral HOTIs from Chern insulators. Our findings are relevant to establish higher order topology in systems such as the axion insulator candidate EuIn$_2$As$_2$, and cold atomic realizations." @default.
• W3009141303 created "2020-03-13" @default.
• W3009141303 creator A5005726619 @default.
• W3009141303 creator A5040235295 @default.
• W3009141303 creator A5062507746 @default.
• W3009141303 date "2019-12-12" @default.
• W3009141303 modified "2023-10-12" @default.
• W3009141303 title "Quantization in Chiral Higher Order Topological Insulators: Circular Dichroism and Local Chern Marker" @default.
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• W3009141303 doi "https://doi.org/10.1103/physrevlett.123.247401" @default.
• W3009141303 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31922878" @default.
• W3009141303 hasPublicationYear "2019" @default.
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