We investigate momentum-dependent transient spin dynamics after photoirradiation in a two-dimensional Mott insulator described by a half-filled Hubbard model on a square lattice by using a numerically exact-diagonalization technique. We find a temporal oscillation in the static spin structure factor of a 18×18 periodic lattice. The oscillation exhibits an antiphase behavior between, for example, two orthogonal momentum directions parallel and perpendicular to the electric field of a pump pulse. The origin of the antiphase oscillation is attributed to a photoexcited wave function that has overlap with eigenstates producing the B 1g bimagnon Raman intensity. Observing such antiphase oscillations will be a big challenge for time-resolved resonant elastic x-ray scattering experiments.
|Journal||Journal of Physics: Conference Series|
|Publication status||Published - 17 Mar 2022|
|Event||2020 International Conference on Strongly Correlated Electron Systems, SCES 2020 - Campinas, Virtual, Brazil|
Duration: 27 Sep 2021 → 1 Oct 2021