Shot Noise in SU(N) Quantum Dot Kondo Effects
arXiv:0708.0819 · doi:10.1103/PhysRevLett.100.036603
Abstract
We study shot noise in the current of quantum dots whose low-energy behaviour corresponds to an SU(N) Kondo model, focusing on the case N=4 relevant to carbon nanotube dots. For general N, two-particle Fermi liquid interactions have two distinct effects: they can enhance the noise via back-scattering processes with an N-dependent effective charge, and can also modify the coherent partition noise already present without interactions. For N=4, in contrast to the SU(2) case, interactions enhance shot noise solely through an enhancement of partition noise. This leads to a non-trivial prediction for experiment.
4+ pages; error in numerical prefactor describing interaction effect on noise corrected
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