2018/02/28 by Jakub Zakrzewski, Dominique Delande · 1 citation
Physics and Astronomy · #cond-mat.dis-nn
paper · pdf · doi:10.1103/physrevb.98.014203
published as Phys. Rev. B 98, 014203 (2018) · version accepted in PRB
arxiv created 2018/07/11 · arxiv updated 2018/07/25
We study many-body localization for a disordered chain of spin 1/2 fermions. In [Phys. Rev. B 94, 241104 (2016)], when both down and up components are exposed to the same strong disorder, the authors observe a power law growth of the entanglement entropy that suggests that many-body localization is not complete; the density (charge) degree of freedom is localized, while the spin degree of freedom is apparently delocalized. We show that this power-like behavior is only a transient effect and that, for longer times, the growth is logarithmic in time suggesting that the spin degree of freedom is also localized, so that the system follows the standard many-body localization scenario. We also study the experimentally relevant case of quasiperiodic disorder.