TL;DR
This paper reports the discovery of a flat band in a PT symmetric photonic lattice caused by non-Hermiticity, enabling controllable light localization and a new method to measure non-Hermiticity.
Contribution
It introduces a novel mechanism for flat band formation in non-Hermitian systems at exceptional points, with implications for light localization and system characterization.
Findings
Flat band appears at the exceptional point of a PT symmetric lattice.
The flat band mode is robust against system size changes.
Gain and loss parameters control flat band properties.
Abstract
We demonstrate the emergence of an entire flat band embedded in dispersive bands at the exceptional point of a PT symmetric photonic lattice. For this to occur, the gain and loss parameter effectively alters the size of the partial flat band windows and band gap of the photonic lattice simultaneously. The mode associated with the entire flat band is robust against changes in the system size and survives even at the edge of the lattice. Our proposal offers a route for controllable localization of light in non-Hermitian systems and a technique for measuring non-Hermiticity via localization.
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