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We demonstrate theoretically how the Kondo effect may be observed in thetransport of spinless electrons through a quantum dot. The role of conductionelectron spin is played by a lead index. The Kondo effect takes place if thereare two close levels in the dot populated by a single electron. Fortemperatures exceeding the Kondo temperature $T\gg T_K$ the conductance ismaximal if the levels are exactly degenerate. However, at zero temperature theconductance is zero at the SU(2) symmetric point, but reaches the unitary limit$G = e^2/h$ for some finite value of the level splitting $\Delta\eps\sim T_K$.Introducing the spin-1/2 for electrons and having two degenerate orbital levelsin the dot allows to observe the SU(4) Kondo effect in a single dot coupled totwo leads.Comment: 6 pages, 2 figure

Minimal realization of the orbital Kondo effect in a quantum dot with two leads