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 S U (4) Kondo effect develops in dots having orbitally degenerate stales 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.
ASJC Scopus subject areas
- Condensed Matter Physics