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Author

Stepan Fomichev

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Preprint Aug 2026

Finite-temperature Green's function cluster expansion from thermofield doubles: Breakdown of the polaron picture

We introduce a method, numerically exact in principle, for computing the momentum- and frequency-resolved single-particle Green's function of a polaron at finite temperature. The method, which we refer to as the finite-temperature Green's function cluster expansion, combines two ingredients: the generalized Green's fun...

M. R. Carbone, Stepan Fomichev, Benedikt Kloss et al. · 1 citation

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