A renormalization factor derived from the Schur complement measures how faithfully downfolded Hamiltonians reproduce exact many-body eigenstates, and including quasiparticle satellites is needed for accurate low-lying spectra.
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Renormalization of States and Quasiparticles in Many-body Downfolding
A renormalization factor derived from the Schur complement measures how faithfully downfolded Hamiltonians reproduce exact many-body eigenstates, and including quasiparticle satellites is needed for accurate low-lying spectra.