1303.5682 (Martin Hohenadler)

Charge and spin correlations of a Peierls insulator after a quench    [PDF]

Martin Hohenadler

Electron-phonon coupling plays a central role for time-dependent phenomena in condensed matter, for example in photo-excitation experiments. We use the continuous-time quantum Monte Carlo method to study the real-time evolution of charge and spin correlation functions of a Peierls insulator after a quench to a noninteracting Hamiltonian. This approach gives exact results, and fully takes into account quantum phonon effects without relying on a Hilbert space truncation. It is also free from a dynamical sign problem. Since thermalization is absent for a quench to an integrable model, we observe dephasing over a time scale set by the electronic hopping integral. Our exact results provide a benchmark for more realistic calculations, and may be directly applicable to experiments with cold atoms or trapped ions.

View original: http://arxiv.org/abs/1303.5682