Quantum Phase Transition in a Multi-Level Dot

Details Quantum Phase Transition in a Multi-Level Dot Quantum Phase Transition in a Multi-Level Dot

2001-08-22

arxiv.org/abs/cond-mat/0108359v2

Phys. Rev. Lett. 88, 016803 (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 5 eps figures, published version

Scientific paper

10.1103/PhysRevLett.88.016803

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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