Abstract
In this paper, we take the double-layer three-component non-Hermitian Lieb lattice system as an example to discuss the topological properties of the non-Hermitian lattice point electromagnetic field system. The topological phase transitions of the Lieb lattice system near the exceptional point are analyzed by calculating the topological invariants. We find that there are abundant topological phase transitions near the exceptional point. This study will help us explore more topological physical phenomena of electromagnetic fields of lattice systems in condensed-matter physics.
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