Quantized electric multipole insulators
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Cites background from "Quantized electric multipole insula..."
...Our metamaterial implementation of the quadrupole topological insulator confirms the existence of the theoretically predicted corner modes [11] and firmly establishes their origin from the bulk quadrupole topology....
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...Microscopically, the corner charges are associated with four corner-localized modes that lie in the middle of the energy gap [11, 21] (Fig....
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...A recent theoretical proposal extended the Berry phase framework to account for higher electric multipole moments [11], revealing the existence of topological phases that have not previously been observed....
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...[11], in which a pair of simple electronic lattice models were proposed in 2D and 3D that exhibit the signatures of quantized electric quadrupole and octupole moments, respectively....
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References
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