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.
(5) Intriguingly, these L roots are evenly distributed along the circumference of a circle [56], with the radius of this circle representing the extent of the splitting of the IP
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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.