Orbital fluctuations and strong correlations in quantum dots

Author: Zaránd, Gergely

Source: Philosophical Magazine, Volume 86, Numbers 13-14, -14/1–11 May 2006 , pp. 2043-2072(30)

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Abstract:

In this paper we focus our attention on quantum dot systems where exotic strongly correlated behaviour develops due to the presence of orbital or charge degrees of freedom. After giving a concise overview of the theory of transport and the Kondo effect through a single-electron transistor, we discuss how the SU (4) Kondo effect develops in dots having orbitally degenerate states and in double dot systems, and then study the singlet–triplet transition in lateral quantum dots. Charge fluctuations and Matveev's mapping to the two-channel Kondo model in the vicinity of a charge degeneracy point are also discussed.

Document Type: Research article

DOI: http://dx.doi.org/10.1080/14786430500469069

Affiliations: 1: Theoretical Physics Department,Institute of Physics, Budapest University of Technology and Economics, Budafoki út 8, H-1521

Publication date: 2006-01-01

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