Fractional shot noise of an SU(N) Kondo system

Abstract: We consider transport through a multi-level interacting quantum dot (N-QD) in Kondo regime. Using the Kotliar-Ruckentein slave boson approach (SBMFA) for N-level Anderson model we define effectively noninteracting quasiparticles of the SU(N) Kondo system ($N=2,3,4,5,6$). Kondo resonance transmission coefficients determine linear noise describing quasiparticle partitioning. To discuss nonlinear conductance, susceptibilities and shot noise in the strong coupling regime, we apply Fermi liquid theory with parameters expressed by susceptibilities of pseudofermions determined within SBMFA. Nonlinear shot noise is dominated by two-quasiparticle scattering. However, we demonstrate that for occupation regions distant from the electron-hole symmetry point, the role of three-body correlations must be revealed.