Functional renormalization group approach to the singlet-triplet transition in quantum dots.

@article{Magnusson2012FunctionalRG,
  title={Functional renormalization group approach to the singlet-triplet transition in quantum dots.},
  author={Einar B. Magnusson and Nils Frederik Hasselmann and Ivan Andreevich Shelykh},
  journal={Journal of physics. Condensed matter : an Institute of Physics journal},
  year={2012},
  volume={24 36},
  pages={
          365602
        }
}
We present a functional renormalization group approach to the zero bias transport properties of a quantum dot with two different orbitals and in the presence of Hund's coupling. Tuning the energy separation of the orbital states, the quantum dot can be driven through a singlet-triplet transition. Our approach, based on the approach by Karrasch et al (2006 Phys. Rev. B 73 235337), which we apply to spin-dependent interactions, recovers the key characteristics of the quantum dot transport… 
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