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Regensburg 2013 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 40: Poster Session Correlated Electrons

TT 40.7: Poster

Wednesday, March 13, 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 Kirchner31Forschungszentrum 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)

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