Exact crossover Green function in the two-channel and two-impurity Kondo models

Details Exact crossover Green function in the two-channel and two-impurity Kondo models Exact crossover Green function in the two-channel and two-impurity Kondo models

2011-01-15

arxiv.org/abs/1101.3028v2

Phys. Rev. Lett. 106, 147202 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.106.147202

Symmetry-breaking perturbations destabilize the critical points of the two-channel and two-impurity Kondo models, thereby leading to a crossover from non-Fermi liquid behavior to standard Fermi liquid physics. Here we use an analogy between this crossover and one occurring in the boundary Ising model to calculate the full zero temperature crossover Green function analytically. In remarkable agreement with our numerical renormalization group calculations, the single exact function applies for an arbitrary mixture of the relevant perturbations in each model. This rich behavior resulting from finite channel asymmetry, inter-lead charge transfer and/or magnetic field should be observable in quantum dot or tunneling experiments.

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