Tunable shot noise in parallel-coupled double quantum dots' system

We investigate the current and the shot noise in a system composed of two quantum dots symmetrically connected to two external leads. Within the technique of quantum rate equations, the general expressions for the current and the shot noise are derived. It is found that, when the energy levels of the two dots are not aligned, the interdot coupling can result in super-Poissonian shot noise. By tuning the external magnetic flux symmetrically applied to the system, the transition between sub-Poissonian and super-Poissonian noise can be realized. If the distribution of the magnetic flux is inhomogeneous, the shot noise can be reduced or further enhanced.