Non-Hermitian generalization of Rayleigh-Schrödinger perturbation theory
Wei-Ming Chen, Yen-Ting Lin, Chia-Yi Ju
The authors develop a perturbation theory for non-Hermitian systems based on a geometric formalism that yields relatively simple recursive formulas for the perturbed eigenvectors and eigenvalues. The authors provide an example and show that the method proposed reduces to the standard Rayleigh-Schr\"odinger perturbation theory in the Hermitian regime.
arXiv:2412.05166•Physical Review A•Feb 7, 2025•6 citations