3 papers
cond-mat.str-el2025
Pairing boost from enhanced spin-fermion coupling in the pseudogap regime
Yang Yu, Sergei Iskakov, Emanuel Gull +2
We perform a fluctuation analysis of the pairing interaction in the hole-doped Hubbard model within the dynamical cluster approximation. Our analysis reveals that spin-fluctuation-…
cond-mat.str-el2025
Minimal pole representation for spectral functions
Lei Zhang, André Erpenbeck, Yang Yu +1
Representing spectral densities, real-frequency, and real-time Green's functions of continuous systems by a small discrete set of complex poles is an ubiquitous problem in condense…
cond-mat.str-el2024
Minimal pole representation and analytic continuation of matrix-valued correlation functions
Lei Zhang, Yang Yu, Emanuel Gull
We present a minimal pole method for analytically continuing matrix-valued imaginary frequency correlation functions to the real axis, enabling precise access to off-diagonal eleme…