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Coexistence of dipolar and quadrupolar higher-order topology

arXiv Physics Wednesday 03 June 2026, 04:00 UTC By Konstantin Rodionenko, Maxim Mazanov, Maxim A. Gorlach 1 min read
Key Points

Announce Type: new Abstract: Two-dimensional higher-order topological insulators are typically classified either as dipolar or quadrupolar depending on the relevant invariant. These two classes were previously considered non-overlapping. Here we put forward an example system exhibiting dipolar and quadrupolar higher-order topology simultaneously, suggest its implementation using the arrays of laser-written evanescently coupled optical waveguides and support our conclusions by the full-wave...

arXiv:2606.03950v1 Announce Type: new Abstract: Two-dimensional higher-order topological insulators are typically classified either as dipolar or quadrupolar depending on the relevant invariant. These two classes were previously considered non-overlapping. Here we put forward an example system exhibiting dipolar and quadrupolar higher-order topology simultaneously, suggest its implementation using the arrays of laser-written evanescently coupled optical waveguides and support our conclusions by the full-wave numerical simulations.
Originally published by arXiv Physics Read original →

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