For a nonreciprocal Kane-Lubensky chain, the zero-mode skin effect is predicted to coincide with a phase where the Petermann factor diverges exponentially with system size.
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Nonreciprocal response theory of nonhermitian mechanical metamaterials: response phase transition from the skin effect of zero modes
For a nonreciprocal Kane-Lubensky chain, the zero-mode skin effect is predicted to coincide with a phase where the Petermann factor diverges exponentially with system size.