General way to define tunneling time
Shu Zheng1, Hao Xiaolei2, †, Li Weidong2, Chen Jing1, 3, 4, ‡
       

A comparison between time t Re, t Im, and τ t as a function of κ d with E=0.1 a.u. and V 0=1.0 a.u. The atomic units are used with e = m = = 1 .