Reveals that coupled pseudomodes can generate spectral densities beyond simple Lorentzians due to non-diagonalizable Hamiltonians, provides exact matching method, and demonstrates non-convergence for infinite evenly spaced uncoupled pseudomodes.
This is analogous to find- ing the eigendecomposition of a Hermitian matrix as H|m⟩=σ m|m⟩, but for a complex-symmetric matrix
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Subtleties in the pseudomodes formalism
Reveals that coupled pseudomodes can generate spectral densities beyond simple Lorentzians due to non-diagonalizable Hamiltonians, provides exact matching method, and demonstrates non-convergence for infinite evenly spaced uncoupled pseudomodes.