At an infernal point, a boundary-coupling perturbation of strength ε splits the degenerate energies by ε^(1/L), with L the system size, and this sensitivity persists away from the exact infernal point.
Rotter, A non-hermitian hamilton operator and the physics of open quantum systems, Journal of Physics A: Mathematical and Theoretical 42, 153001 (2009)
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Super-enhanced Sensitivity in Non-Hermitian Systems at Infernal Points
At an infernal point, a boundary-coupling perturbation of strength ε splits the degenerate energies by ε^(1/L), with L the system size, and this sensitivity persists away from the exact infernal point.