Magnetic field tunes exceptional points
Introducing an external magnetic field as an extra topological parameter enables continuous tuning and topological restructuring of non-Hermitian exceptional points in a photonic crystal slab.
Xingqi, Zhao · Wang, Jiajun · Liu, Wenzhe · Shi, Lei · Zi, Jian
Physical Review Letters 2025
Closed exceptional point ring continuously evolved by external magnetic field
Paired exceptional points approach and annihilate as Fermi arc shrinks
Closed ring topology in Poincaré sphere
Topological charge transfers between Fermi arc and circularly polarized states