Description
Relaxation rates in nearly integrable systems usually increase quadratically with the strength of the perturbation that breaks integrability. We show that the relaxation rates can be significantly smaller in systems that are integrable along two intersecting lines in the parameter space. In the vicinity of the intersection point, the relaxation rates of certain observables increase with the fourth power of the distance from this point, whereas for other observables one observes standard quadratic dependence on the perturbation. As a result, one obtains exceedingly long-living prethermalization but with a reduced number of the nearly conserved operators. We show also that such a scenario can be realized in spin ladders.
Primary authors
Dr
Jacek Herbrych
(Wroclaw University of Science and Technology)
Jakub Pawłowski
(Wroclaw University of Science and Technology)
Prof.
Marcin Mierzejewski
(Wroclaw University of Science and Technology)
Dr
Miłosz Panfil
(University of Warsaw)
