Universal structure of exceptional points revealed in nonlinear light‑based systems

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Researchers from the Institute for Photonic Quantum Systems at Paderborn University and the University of Arizona revealed in a new study that exceptional points in nonlinear light-based systems follow a universal geometric order. This finding advances understanding of modern physics phenomena related to changes in the properties of matter, space, or time.

Exceptional points, or EPs for short, are among the phenomena of modern physics. These are special points or locations at which the properties of matter, space or time change. In a new theoretical study, researchers from the Institute for Photonic Quantum Systems (PhoQS) at Paderborn University, in collaboration with researchers from the University of Arizona, have shown that exceptional points in nonlinear systems follow a universal geometric order—something that was previously unclear. Their findings have been published in the journal Nature Communications.