Before revision: Many experimental techniques have been developed in an attempt to measure this quantity directly but theorists and experimentalists still face many challenges.Chen F, Hihath J, Huang Z, Li X, Tao NJ.
After revision: ,Many experimental techniques have been developed in an attempt to measure this quantity directly but theorists and experimentalists still face many challenges.Chen F, Hihath J, Huang Z, Li X, Tao NJ.