Chaotic dynamical ferromagnetic phase induced by non-equilibrium quantum fluctuations
Abstract
We investigate the robustness of a dynamical phase transition against quantum fluctuations by studying the impact of a ferromagnetic nearest-neighbour spin interaction in one spatial dimension on the non-equilibrium dynamical phase diagram of the fully-connected quantum Ising model. In particular, we focus on the transient dynamics after a quantum quench and study the pre-thermal state via a combination of analytic time-dependent spin-wave theory and numerical methods based on matrix product states. We find that, upon increasing the strength of the quantum fluctuations, the dynamical critical point fans out into a chaotic dynamical phase within which the asymptotic ordering is characterised by strong sensitivity to the parameters and initial conditions. We argue that such a phenomenon is general, as it arises from the impact of quantum fluctuations on the mean-field out of equilibrium dynamics of any system which exhibits a broken discrete symmetry.
Cite
@article{arxiv.1706.05062,
title = {Chaotic dynamical ferromagnetic phase induced by non-equilibrium quantum fluctuations},
author = {A. Lerose and J. Marino and B. Zunkovic and A. Gambassi and A. Silva},
journal= {arXiv preprint arXiv:1706.05062},
year = {2018}
}
Comments
5+8 pages, 3+2 figures; revised version