Out-of-equilibrium Kondo effect in Double Quantum Dots

Details Out-of-equilibrium Kondo effect in Double Quantum Dots Out-of-equilibrium Kondo effect in Double Quantum Dots

1999-12-20

arxiv.org/abs/cond-mat/9912376v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures. Final version to be published in PRL

Scientific paper

10.1103/PhysRevLett.85.1946

The out-of-equilibrium transport properties of a double quantum dot system in the Kondo regime are studied theoretically by means of a two-impurity Anderson hamiltonian with interimpurity hopping. The hamiltonian is solved by means of a non-equilibrium generalization of the slave-boson mean-field theory. It is demonstrated that measurements of the differential conductance dI/dV, for the appropriate values of voltages and tunneling couplings, can give a direct observation of the coherent superposition between the many-body Kondo states of each dot. For large voltages and arbitrarily large interdot tunneling, there is a critical voltage above which the physical behaviour of the system is again that of two decoupled quantum dots, i.e two Kondo singularities pinned at each chemical potential.

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