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Abstract:
The transport properties of a single quantum dot were measured at low
temperature in a regime of strong asymmetric tunnel coupling to leads.
By tuning this asymmetry, the two parameters of the Kondo effect in a
quantum dot, the Kondo temperature and the zero-bias zero-temperature
conductance, were independently controlled. A careful analysis of the
Coulomb energies and of the tunnel couplings was performed. It allowed
an estimate of the Kondo temperature independently of its value
obtained via the temperature dependence of the conductance. Both are in
good agreement. We finally compared our experimental data with an exact
solution of the Kondo problem which provides the dependence of the
differential conductance on temperature and source-drain voltage.
Theoretical expectations fit quite well our experimental data in the
equilibrium and out-of-equilibrium regimes.
