Charge asymmetry in the Heisenberg model

Abstract

Supplementing the Heisenberg model with a Hubbard-commuting kinetic of electrons adds to its spectrum without interference. One consequence is the precise incorporation of canonical linear spin wave theory within the time-dependent Hartree-Fock framework, as pure localization emerges from itinerant dynamics. This embedding method generalizes to all spin-1/2 models and is expected to extend to multi-orbital systems. Away from half-filling, differential tuning of doublon and holon motion imparts asymmetry to ordering and fluctuations. This suggests that, in effective electronic theories, kinetic interaction couplings are as significant as underlying band parameters when modeling asymmetric phenomena near the Mott insulator.