Conduction through a quantum dot near a singlet-triplet transition

Details Conduction through a quantum dot near a singlet-triplet transition Conduction through a quantum dot near a singlet-triplet transition

2000-05-24

arxiv.org/abs/cond-mat/0005427v2

Phys. Rev. Lett. 85, 2993 (2000)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevLett.85.2993

Kondo effect in the vicinity of a singlet-triplet transition in a vertical quantum dot is considered. This system is shown to map onto a special version of the two-impurity Kondo model. At any value of the control parameter, the system has a Fermi-liquid ground state. Explicit expressions for the linear conductance as a function of the control parameter and temperature $T$ are obtained. At T=0, the conductance reaches the unitary limit $\sim 4e^2/h$ at the triplet side of the transition, and decreases with the increasing distance to the transition at the singlet side. At finite temperature, the conductance exhibits a peak near the transition point.

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