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

Abstract

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.

Majorana stellar representation for mixed-spin (s, 1/2) systems*

“…Therefore, this representation spontaneously provides an intuitive way to study high spin systems from geometrical perspectives, which has made the MSR a useful tool in many different fields, e.g., classification of entanglement in symmetric quantum states, [5][6][7][8][9][10][11][12] analyzing the spectrum of the Lipkin-Meshkov-Glick model, [13,14] studying Bose condensate with high spins, [15][16][17][18][19][20][21][22] and calculating geometrical phases of large-spin systems. [23][24][25] In addition, the MSR can be employed in quantum metrology [26,27] and in describing polarization states of N photons. [28] Moreover, the MSR provides many useful insights into high dimensional quantum states.…”