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physics.comp-ph2026
Compact and Stable Representation of Real-Frequency Spectral Functions for Machine Learning
Xinyang Dong, Ido Zemach, Lei Zhang +2
We introduce a compact and stable moment representation for real-frequency Green's functions, hybridization functions, and self-energies for machine-learning applications, avoiding…
cond-mat.str-el2026
Validity and Limits of Low Order Hybridization Expansion Approaches for Multi-Orbital Systems
Dolev Goldberger, Ido Zemach, Lei Zhang +4
Low-order hybridization expansion methods such as the non-crossing approximation (NCA) and the one-crossing approximation (OCA) are widely used impurity solvers in the study of str…