The Kondo Temperature of SU(4) Symmetric Quantum Dots

Michele Filippone (1) , Catalin Pascu Moca , Gergely Zarand (2) , Christophe Mora (1)

1 LPA - Laboratoire Pierre Aigrain
2 Institute of Physics, Theoretical Physics Department

A path integral approach is used to derive a closed analytical expression for the Kondo temperature of the SU(4) symmetrical Anderson model. In contrast to the SU(2) case, the prefactor of the Kondo temperature is found to display a peculiar orbital energy (gate voltage) dependence, reflecting the presence of various SU(4) mixed valence fixed points. Our analytical expressions are tested against and confirmed by numerical renormalization group computations.

Domaines: Systèmes mésoscopiques et effet Hall quantique [cond-mat.mes-hall]

Michele Filippone, Catalin Pascu Moca, Gergely Zarand, Christophe Mora. The Kondo Temperature of SU(4) Symmetric Quantum Dots. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2014, 90 (12), pp.121406. ⟨10.1103/PhysRevB.90.121406⟩. ⟨hal-01146213⟩