SU(4) versus SU(2) Kondo effect in double quantum dot

Abstract

We consider the spin and orbital Kondo effect in a parallel arrangement of two strongly electrostatically coupled quantum dots. Increasing the exchange of electrons between the dots through the attached leads induces the transition between the SU(4) spin- and orbital Kondo effect and SU(2) spin Kondo effect. Being the same for the SU(4) and SU(2) symmetry points, the Kondo temperature drops slightly in the intermediate regime. Experimentally, two kinds of Kondo effects can be discriminated by the sensitivity to the suppression of the spin Kondo effect by Zeeman field. The dependence of Kondo temperature on Zeeman field and the strength of electronic exchange mediated by the leads is analyzed in detail.

5 pages, 3 figures. Consideration extended to include finite orbital magnetic fields. References added, typos corrected

References in corpus (3)

• Kondo effect in quantum dots coupled to ferromagnetic leads
• SU(4) Fermi Liquid State and Spin Filtering in a Double Quantum Dot System
• Pseudo-spin Kondo effect versus hybridized molecular states in parallel Double Quantum Dots

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• First-principles quantum transport simulation of CuPc on Au(111) and Ag(111)
• Intra- and inter-shell Kondo effects in carbon nanotube quantum dots
• Suppressed Josephson phase transition in one parallel double-quantum-dot junction