Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 40: Poster Session Correlated Electrons
TT 40.7: Poster
Mittwoch, 13. März 2013, 15:00–19:00, Poster D
Conductance scaling in Kondo correlated quantum dots: role of level asymmetry — •Lukas Merker1, Theo Costi1, Enrique Muñoz2, and Stefan Kirchner3 — 1Forschungszentrum Jülich (PGI-2 / IAS-3), Jülich, Germany — 2Pontificia Universidad Católica de Chile, Santiago, Chile — 3MPI PKS & CPfS, Dresden, Germany
The low temperature electrical conductance through correlated quantum dots provides a sensitive probe of the
physics (e.g., of Fermi-liquid vs non-Fermi-liquid behavior) of such systems. Here, we investigate
the role of level asymmetry (gate voltage) and local Coulomb
repulsion (charging energy) on the low temperature and low field scaling properties of the linear conductance of a quantum dot
described by the single level Anderson impurity model. We use the numerical renormalization group [1] and
renormalized superperturbation theory [2] to quantify the regime of gate voltages and charging energies
where universal Kondo scaling may be observed and also quantify the deviations from this universal behavior with
increasing gate voltage away from the Kondo regime and with decreasing charging energy. Our results could be
a useful guide for detailed experiments on conductance scaling in semiconductor and molecular quantum dots exhibiting
the Kondo effect [3,4].
[1] L. Merker, et al., preprint (2012)
E. Muñoz, C. J. Bolech, S. Kirchner, Phys. Rev. Lett. (in press), arXiv:1111.4076
A. V. Kretinin, et al., Phys. Rev. B84, 245316 (2012)
G. D. Scott, et al., Phys. Rev. B79, 165413 (2009)