Rotational symmetry breaking in deformed Reuleaux-triangle resonator simplifies exceptional point achievement

The spectral degeneracies emerging as a consequence of parity-time (PT) symmetry exhibit a profound divergence from their conventional counterparts. They possess non-Hermitian nature and are designated as exceptional points (EPs), marking instances where the real and corresponding imaginary portions of specific eigenvalues align perfectly, alongside a coalescence of their associated eigenvectors.