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