Structure dependence of tunneling lifetimes in double-barrier structures

Abstract

It is known that the structure dependence of the lifetimes of quasi-bound states in rectangular multi-barrier structures is significant but still ambiguous. In this paper, we report the elaborate dependence of the lifetimes of higher quasi-bound states in symmetrical double-barrier structures on structure parameters, such as well width, barrier width and composition mole fraction. Based on the energy uncertainty condition at quasi-bound states method, numerical calculations are carried out to investigate the structure dependence of the lifetimes of higher quasi-bound states. The calculation results show that the lifetimes of higher quasi-bound states vary with structure parameters as a simple and exact function, and that the lifetimes of higher quasi-bound states increase exponentially with structure parameters.