A peak in density dependence of electron spin relaxation time in $n$-type bulk GaAs in metallic regime

We demonstrate that the peak in the density dependence of electron spin relaxation time in $n$-type bulk GaAs in the metallic regime predicted by Jiang and Wu [Phys. Rev. B {\bf 79}, 125206 (2009)] has been realized experimentally in the latest work by Krau\ss {\em et al}. [arXiv:0902.0270].