Phys. Rev. B 71, 035333 (2005): Entin-Wohlman et al.

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

[Issue 3 – 15 January 2005 ]

Kondo effect in complex mesoscopic structures

: O. Entin-Wohlman^1,2,3, A. Aharony^1,2, and Y. Meir^1,4
: 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.

Š2005 The American Physical Society

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