Antiphase Oscillations in the Time-Resolved Spin Structure Factor of a Photoexcited Mott Insulator

Abstract

Motivated by the recent development of time-resolved resonant-inelastic x-ray scattering (TRRIXS) in photoexcited antiferromagnetic Mott insulators, we numerically investigate momentum-dependent transient spin dynamics in a half-filled Hubbard model on a square lattice. After turning off a pumping photon pulse, the intensity of a dynamical spin structure factor temporally oscillates with frequencies determined by the energy of two magnons in the antiferromagnetic Mott insulator. We find an antiphase behavior in the oscillations between two orthogonal momentum directions, parallel and perpendicular to the electric field of a pump pulse. The phase difference comes from the $B_{1g}$ channel of the two-magnon excitation. Observing the antiphase oscillations will be a big challenge for TRRIXS experiments when their time resolution will be improved by more than an order of magnitude.

5 pages, 4 figures

References in corpus (8)

• Nonlinear light-matter interaction at terahertz frequencies
• Tracking Cooper Pairs in a Cuprate Superconductor by Ultrafast Angle-Resolved Photoemission
• Ultrashort Lifetime Expansion for Indirect Resonant Inelastic X-ray Scattering
• Producing Coherent Excitations in Pumped Mott Antiferromagnetic Insulators
• Resonant Two-Magnon Raman Scattering and Photoexcited States in Two-Dimensional Mott Insulators
• Evidence for photoinduced sliding of the charge-order condensate in La${}_{1.875}$Ba${}_{0.125}$CuO${}_4$
• Photoinduced absorptions inside the Mott gap in the two-dimensional extended Hubbard model
• Photoinduced $\eta$ pairing in the Kondo lattice model

Cited by in corpus (6)

• Ultrafast renormalization of the onsite Coulomb repulsion in a cuprate superconductor
• Supermagnonic propagation in two-dimensional antiferromagnets
• Optical absorption activated by an ultrashort half-cycle pulse in metallic and superconducting states of the Hubbard model
• Time-resolved X-ray Spectroscopy from the Atomic Orbital Ground State Up
• Exciton-assisted low-energy magnetic excitations in a photoexcited Mott insulator on a square lattice
• X-Ray Scattering from Light-Driven Spin Fluctuations in a Doped Mott Insulator