Universal algebraic growth of entanglement entropy in many-body localized systems with power-law interactions

Abstract

Power-law interactions play a key role in a large variety of physical systems. In the presence of disorder, these systems may undergo many-body localization for a sufficiently large disorder. Within the many-body localized phase the system presents in time an algebraic growth of entanglement entropy, $S_{vN}(t)\propto t^{\gamma }$. Whereas the critical disorder for many-body localization depends on the system parameters, we find by extensive numerical calculations that the exponent $\gamma$ acquires a universal value ${\gamma }_c\simeq 0.33$ at the many-body localization transition, for different lattice models and decay powers. Moreover, our results suggest an intriguing relation between ${\gamma }_c$ and the critical minimal decay power of interactions necessary for the observation of many-body localization.

arXiv comment5 pages, 3 figures, plus Supplementary Material

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