3 papers
cond-mat.stat-mech2023
Estimation of equilibration time scales from nested fraction approximations
Christian Bartsch, Anatoly Dymarsky, Mats H. Lamann +3
We consider an autocorrelation function of a quantum mechanical system through the lens of the so-called recursive method, by iteratively evaluating Lanczos coefficients, or solvin…
cond-mat.stat-mech2019
Relaxation of dynamically prepared out-of-equilibrium initial states within and beyond linear response theory
Jonas Richter, Mats H. Lamann, Christian Bartsch +2
We consider a realistic nonequilibrium protocol, where a quantum system in thermal equilibrium is suddenly subjected to an external force. Due to this force, the system is driven o…
cond-mat.stat-mech2017
Necessity of eigenstate thermalization for equilibration towards unique expectation values when starting from generic initial states
Christian Bartsch, Jochen Gemmer
We investigate dynamical equilibration of expectation values in closed quantum systems for realistic non-equilibrium initial states. Thereby we find that the corresponding long tim…