In a nonlinear non-Hermitian lattice, subskin modes localized below the edge can form without the strict coupling constraints required in linear systems, while deeper subskin modes still require fine-tuning.
However, the nonlinear interaction lifts this restriction on the couplings, allowing the sub- skin modeψ (1) n to appear over a wide range of couplings
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Subskin modes in a nonlinear non-Hermitian system
In a nonlinear non-Hermitian lattice, subskin modes localized below the edge can form without the strict coupling constraints required in linear systems, while deeper subskin modes still require fine-tuning.