Phys. Rev. B 71, 035333 (2005) [11 pages]

[Issue 3 – 15 January 2005 ]



Kondo effect in complex mesoscopic structures

O. Entin-Wohlman1,2,3, A. Aharony1,2, and Y. Meir1,4
1Department of Physics, Ben Gurion University, Beer Sheva 84105, Israel
2School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel
3Albert Einstein Minerva Center for Theoretical Physics, Weizmann Institute of Science, Rehovot 76100, Israel
4The Ilse Katz Center for Meso- and Nano-Scale Science and Technology, Ben Gurion University, Beer Sheva 84105, Israel
Received 20 September 2004; revised 19 November 2004; published 21 January 2005

We study the Kondo effect of a quantum dot placed in a complex mesoscopic structure. Assuming that electronic interactions are taking place solely on the dot, and focusing on the infinite Hubbard interaction limit, we use a decoupling scheme to obtain an explicit analytic approximate expression for the dot Green function, which satisfies certain Fermi-liquid relations at zero temperature. The details of the complex structure enter into this expression only via the self-energy for the noninteracting case. The effectiveness of the expression is demonstrated for the single-impurity Anderson model and for the T-shaped network.

2005 The American Physical Society



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