Fractional Shot Noise in the Kondo Regime
Felix von Oppen
Fachbereich Physik, FU Berlin, Arnimallee 14, 14195 Berlin, Germany
Low temperature transport through a quantum dot in the
Kondo regime proceeds by a universal combination of elastic and
inelastic processes, as dictated by the low-energy Fermi-liquid fixed
point. We show that as a result of inelastic processes, the charge
detected by a shot-noise experiment is enhanced relative to the
noninteracting situation to a universal fractional value, e*
=
5/3
e.
Thus, shot noise reveals that the Kondo effect involves many-body
features even at low energies, despite its Fermi-liquid nature. We
discuss the influence of symmetry breaking perturbations.
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