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Light’s Unusual Behaviour at Corners Reveals Hidden Physics Layers

Quantum ZeitgeistJune 15, 20264 min read

Until now, a photonic system’s ability to exist, localise, become visible, and dynamically evolve were inextricably linked. New work demonstrates that the same topological sector within a photonic lattice can appear bright, skin-dark, or flux-dark, measured locally. This separation, achieved through complex-gauge control, offers a pathway to independently manipulate light’s behaviour.

A new method for controlling anomalous Floquet corner responses in a non-Hermitian physical-synthetic photonic lattice has been developed by W. C. Ning and X. Z. Zhang at College of Physics and Materials Science, in collaboration with Tianjin Normal University. The method uses a two-step modulation protocol utilising both real synthetic flux and imaginary gauge fields to manipulate loop interference and non-reciprocal envelopes. It predicts three distinct physical layers within anomalous corner pairs and reveals how complex gauge fields can tune exceptional…

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