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The nonequilibrium variational-cluster approach is applied to study thereal-time dynamics of the double occupancy in the one-dimensional Fermi-Hubbardmodel after different fast changes of hopping parameters. A simple referencesystem, consisting of isolated Hubbard dimers, is used to discuss differentaspects of the numerical implementation of the approach in the generalframework of nonequilibrium self-energy functional theory. Opposed to a directsolution of the Euler equation, its time derivative is found to serve asnumerically tractable and stable conditional equation to fix the time-dependentvariational parameters.

Nonequilibrium variational-cluster approach to real-time dynamics in the Fermi-Hubbard model