Quantized electric multipole insulators
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...There, we also provide two further topological characterizations, one based on so-called nested Wilson loop (4) and entanglement spectra (21–23) and one applicable to systems that are in addition invariant under the product Î T̂ of inversion symmetry Î and T̂ (3)....
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...(4) has introduced second-order 2D TIs and third-order 3D TIs....
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...(4) generalize this bulk-boundary correspondence: In two and three dimensions, these insulators exhibit no edge or surface states, respectively, but feature gapless, topological corner excitations corresponding to quantized higher electric multipole moments....
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