Journal
PHYSICAL REVIEW LETTERS
Volume 88, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.88.016803
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We discuss electronic transport through a lateral quantum dot close to the singlet-triplet degeneracy in the case of a single conduction channel per lead. By applying the numerical renormalization group, we obtain rigorous results for the linear conductance and the density of states. A new quantum phase transition of the Kosterlitz-Thouless-type is found, with an exponentially small energy scale T* close to the degeneracy point. Below T*, the conductance is strongly suppressed, corresponding to a universal dip in the density of states. This explains recent transport measurements.
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