100 citations · 114 across the 3 of their papers we have counts for
4 papers
Enforcing conservation laws in nonequilibrium cluster perturbation theory
Christian Gramsch, Michael Potthoff
Using the recently introduced time-local formulation of the nonequilibrium cluster perturbation theory (CPT), we construct a generalization of the approach such that macroscopic co…
Lehmann representation of the nonequilibrium self-energy
Christian Gramsch, Michael Potthoff
It is shown that the non-equilibrium self-energy of an interacting lattice-fermion model has a unique Lehmann representation. Based on the construction of a suitable non-interactin…
Hamiltonian-based impurity solver for nonequilibrium dynamical mean-field theory
Christian Gramsch, Karsten Balzer, Martin Eckstein +1
We derive an exact mapping from the action of nonequilibrium dynamical mean-field theory (DMFT) to a single-impurity Anderson model (SIAM) with time-dependent parameters, which can…
Quenches in a quasi-disordered integrable lattice system: Dynamics and statistical description of observables after relaxation
Christian Gramsch, Marcos Rigol
We study the dynamics and the resulting state after relaxation in a quasi-disordered integrable lattice system after a sudden quench. Specifically, we consider hard-core bosons in…