Berlin 2005 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 22: Transport - Nanoelectronics II: Quantum Dots and Wires, Point Contacts

TT 22.8: Vortrag

Montag, 7. März 2005, 16:00–16:15, TU H2053

Nonequilibrium Kondo physics in double quantum dots — •Yi-feng Yang and Karsten Held — MPI for solid state research, Stuttgart

We study the multi-orbital Kondo effect at a finite bias, generalizing the nonequilibrium scaling approach suggested recently by Rosch et al.[Phys. Rev. Lett. 90, 076804 (2003)]. The finite current through the quantum dots gives rise to a cutoff of the scaling equations, which is calculated from the spin susceptibility. We study in detail the strong orbital Kondo effect in a parallel double quantum dot. The results are consistent with recent experiments. Moreover, we also report on genuine nonequilibrium effects like a negative differential conductance at finite bias voltage.