Journal
PHYSICAL REVIEW LETTERS
Volume 85, Issue 9, Pages 1946-1949Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.1946
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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 nonequilibrium generalization of the slave-boson mean-held theory. It is demonstrated that measurements of the differential conductance dI/dV, far 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 behavior of the system again resembles that of two decoupled quantum dots.
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