Kondo Effect in the Transport Through a Quantum Dot: Extended Noncrossing Approximation Approach

Details Kondo Effect in the Transport Through a Quantum Dot: Extended Noncrossing Approximation Approach Kondo Effect in the Transport Through a Quantum Dot: Extended Noncrossing Approximation Approach

2003-03-18

arxiv.org/abs/cond-mat/0303352v1

Acta Physica Polonica B 34, 633 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES02), Crakow, Poland, July 10-13, 2002

Scientific paper

We calculate the conductance through a single quantum dot coupled to metallic leads, modeled by the spin 1/2 Anderson model. We adopt the finite-U extension of the noncrossing approximation method. Our results are in good agreement with exact numerical renormalization group results both in the high temperature and in the Kondo (low temperature) regime. Thanks to this approach, we were able to fit fairly well recently reported measurements by S. De Franceschi et al. in a quantum dot device. We show that, contrarily to what previously suggested, the conductance of this particular device can be understood within the spin-1/2 Anderson model, in which the effects of the multilevel structure of the dot are neglected.

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