Effects of frustration on the nonequilibrium dynamics of photo-excited lattice systems

Abstract

We theoretically investigate the effects of the lattice geometry on the nonequilibrium dynamics of photo-excited carriers in a half-filled two-dimensional Hubbard model. Using a nonequilibrium generalization of the dynamical cluster approximation, we compare the relaxation dynamics in lattices which interpolate between the triangular lattice and square lattice configuration and thus reveal the role of the geometric frustration in these strongly correlated nonequilibrium systems. In particular, we show that the cooling effect resulting from the disordering of the spin background is less effective in the triangular case because of the frustration. This manifests itself in a longer relaxation time of the photo-doped population, as measured by the time-resolved photo-emission signal, and a higher effective temperature of the photo-doped carriers in the non-thermal steady state after the intra-Hubbard-band thermalization.

10 pages, 5 figures

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• Electron-light interaction in nonequilibrium -- exact diagonalization for time dependent Hubbard Hamiltonians
• Prethermal time-crystalline spin ice and monopole confinement in a driven magnet
• Space-time symmetry breaking in nonequilibrium frustrated magnetism
• Light-induced switching of magnetic order in the anisotropic triangular-lattice Hubbard model
• Mechanism for Synchronization of Charge Oscillations in Dimer Lattices