Multi-step shot noise spectrum induced by a local large spin

We use non-equilibrium Green's function method to analyze the shot noise spectrum of artificial single molecular magnets (ASMM) model in the strong spin-orbit coupling limit in sequential tunneling regime, mainly focusing on the effects of local large spin. In the linear response regime, the shot noise shows 2S+1 peaks and is strongly spin-dependent. In the nonlinear response regime, one can observe 2S+1 steps in shot noise and Fano factor. In these steps one can see the significant enhancement effect due to the spin-dependent multi-channel process of local large spin, which reduces electron correlations.