  We investigate transmission properties of triple barrier parabolic double
quantum well structure using the non-equilibrium Green's function method. In
particular, we examine the effect of system parameters on transmission
coefficient. The properties of the electronic state are also studied as a
function of the system parameters (such as the well and barrier widths) and
electric field bias. We also tested energy electronic state with calculating
the density of states. It has been found that the first resonant peaks shift
towards the lower energy region as the middle barrier width increases. New
resonant peaks emerge when the well widths or depths become wider. These
structures are useful for the design of electronic devices.
