For static site-energy disorder ( red circles ), while longer expansion times than those explored ( τ ≲ 6.3 ħ / t ) would better distinguish insulating behaviour from sub-ballistic and sub-diffusive expansion, a clear trend towards arrested transport ( γ ~ 0) is found for \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\Delta {\rm{/}}t \gg 1$$\end{document} Δ ∕ t ≫ 1 .
1
—
—