Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 37: Correlated Electrons: Quantum Impurities, Kondo Physics

TT 37.1: Vortrag

Freitag, 29. Februar 2008, 10:15–10:30, H 2053

Quantum Transport through Nanodevice — •Frithjof Anders — Institut für Theoretische Physik, Universität Bremen, P.O. Box 330 440, D-28334 Bremen

The electronic transport though nanodevices such as quantum dots and carbon nanotubes are dominated by their small capacitance at low temperatures. The Kondo effect is now a classical hallmark of many-body physics in nanoscale devices governing the crossover between the Coulomb blockade regime and perfect transmission. We present numerical renormalization group (NRG) calculation for the temperature evolution zero-bias conductance which agrees beautifully with recently published experiments on semiconducting carbon nanotube quantum dots.

Furthermore, we discuss a novel approach to steady-state non-equilibrium dynamics at finite bias, based on a combination of an NRG approach to open quantum system and the recently developed time-dependent NRG. The current-voltage characteristics can be obtained for a tunneling junctions as well as symmetric single-electron transistors at arbitrarily low temperatures.