Nonequilibrium transport through parallel double quantum dots in the Kondo regime
arXiv:cond-mat/0502420 · doi:10.1103/PhysRevB.72.235308
Abstract
We extend a perturbative, nonequilibrium renormalization group approach to multi-orbital systems and apply it for studying transport through two parallel quantum dots coupled electrostatically. In general, the conductance shows pronounced Kondoesque peaks at three voltages. One of these peaks disappears if, as in some experiments, one of the dots is decoupled from one of the two leads. For an asymmetric coupling to the leads, also negative differential conductances are possible. This is a genuine nonequilibrium effect, accompanying the Kondoesque peaks. Moreover, a criterion to distinguish spin and orbital Kondo effect in such a system is discussed.
13 pages, 13 figures; 2nd version as published in Phys. Rev. B with an extended outlook paragraph and some additional references
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