Photonic quadrupole topological insulator using orbital-induced synthetic flux

Schulz, JulianJulianSchulzNoh, JihoJihoNohBenalcazar, Wladimir A.Wladimir A.BenalcazarBahl, GauravGauravBahlFreymann, Georg vonGeorg vonFreymann2023-11-232023-11-232022https://publica.fraunhofer.de/handle/publica/45718710.1364/FIO.2022.JW5A.312-s2.0-85146666656We demonstrate that mixing orbitals of different symmetry representations can induce synthetic π-flux threading the lattice. As an experimental demonstration of such a concept, we realize a photonic quadrupole topological insulator in a two-dimensional photonic lattice.enPhotonic quadrupole topological insulator using orbital-induced synthetic fluxconference paper