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Perturbative theory of the non-equilibrium singlet-triplet transition

We study equilibrium and non-equilibrium properties of a two-level quantum dot close to the singlet-triplet transition. We treat the on-site Coulomb interaction and Hund's rule coupling perturbatively within the Keldysh formalism. We compute the spectral functions and the differential conductance of the dot. For moderate interactions our perturbative approach captures the Kondo effect and many of the experimentally observed properties.

preprint2009arXivOpen access
B. HorvathB. LazarovitsG. Zarand
cond-mat.str-el
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Open access3 authors1 topic
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B. HorvathB. LazarovitsG. Zarand

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