A Morse-theoretic topological index defined on the imaginary part of non-Hermitian spectra is shown to count Fermi points and fix the effective central charge of the non-equilibrium steady state.
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Spectral-topology-induced criticality in non-Hermitian fermionic metals
A Morse-theoretic topological index defined on the imaginary part of non-Hermitian spectra is shown to count Fermi points and fix the effective central charge of the non-equilibrium steady state.