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    Time-dependent fluctuating local field approach for the description of correlated fermions dynamics

    L. D. Silakov1,2, Ya. S. Lyakhova1, and A. N. Rubtsov1,3,*

    • *Contact author: ar@rqc.ru

    Phys. Rev. B 113, 235121 – Published 12 June, 2026

    DOI: https://doi.org/10.1103/crr8-vwxq

    Abstract

    We formulate a time-dependent Fluctuating Local Field (TD-FLF) method for correlated fermion dynamics, extending the stationary FLF approach. The wave function is approximated as an ensemble of noninteracting states subject to a classical fluctuating field, with dynamics encoded in the field's time-dependent distribution. This reduces the time-dependent Schrödinger equation to a generalized eigenvalue problem in a significantly reduced basis. Applied to half-filled two-dimensional Hubbard lattices, TD-FLF yields highly accurate results, outperforming mean-field theory and capturing oscillation frequencies and amplitudes in good agreement with exact diagonalization. Its low computational cost and flexibility make TD-FLF a promising tool for simulating driven correlated systems.

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