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Momentum-Space Topological Effects of Nonreciprocity

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posted on 2023-11-30, 05:55 authored by S. Ali Hassani Gangaraj, George W. Hanson
The connection between topology and nonreciprocity in photonic systems is reviewed. Topological properties such as Chern number, and momentum-space properties such as Berry phase and Berry connection, are used to explain back-scattering immune edge states and their topological protection. We consider several examples to illustrate the role of momentum-space topology on wave propagation, and discus recent magnet-less approaches.

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