2005/02/28 by Yi‐feng Yang, Y. -F. Yang, Karsten Held +1 · 1 citation
Engineering · Physics and Astronomy · #Advancements in Semiconductor Devices and Circuit Design #Molecular Junctions and Nanostructures #Quantum and electron transport phenomena #cond-mat.mes-hall #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.72.235308
published as Phys. Rev. B 72, 235308 (2005) · 13 pages, 13 figures; 2nd version as published in Phys. Rev. B with an extended outlook paragraph and some additional references
openalex publication_date 2005/12/06 · arxiv created 2006/01/27 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We extend a perturbative, nonequilibrium renormalization group approach to multiorbital 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.