Nonequilibrium Transport through Double Quantum Dots: Exact Results near Quantum Critical Point

Details Nonequilibrium Transport through Double Quantum Dots: Exact Results near Quantum Critical Point Nonequilibrium Transport through Double Quantum Dots: Exact Results near Quantum Critical Point

2008-09-25

arxiv.org/abs/0809.4304v1

Phys. Rev. Lett. 102, 047201 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures

Scientific paper

We study a double quantum dot in the regime where each dot carries a spin-1/2. This system is described by the 2-impurity Kondo model, having a non-Fermi liquid fixed point for a critical value of the inter-impurity coupling. The Hamiltonian describing the vicinity of the critical point, including the relevant potential scattering perturbations, can be cast in quadratic form. This allows us to predict a universal scaling function for the finite temperature nonlinear conductance along the crossover from the critical point to the surrounding stable fixed points.

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