Fig. 4: Theoretical simulation of the time-resolved resonant inelastic X-ray scattering (trRIXS) spectrum in a pumped Mott insulator.
From: Probing light-driven quantum materials with ultrafast resonant inelastic X-ray scattering
a Dominant excitations in the K-edge (indirect) trRIXS spectrum of the single-band Hubbard model in two dimensions. The open circle represents the core hole, whereas the red zig–zag line is its Coulomb interaction with the valence electron spins (up down arrows). b Evolution of the trRIXS spectrum obtained through exact diagonalization for momentum transfer Q = (1/2, 1/6) reciprocal lattice units (r.l.u.) and incident photon energy tuned to the maximum of the X-ray absorption spectrum. ω denotes the energy loss axis measured in units of hopping energy (th). c Selected trRIXS spectra at different times before and after the pump. Bimagnon features are located at ħω ~ 3J, whereas the Mott-gap excitation continuum is peaked at ħω ~ U = 8th. U is the onsite Coulomb repulsion, whereas \(J=4{t}_{{\rm{h}}}^{2}/U\) is the exchange energy. Adapted with permission from ref. 72. Copyrighted by the American Physical Society.
