Two-channel Kondo physics in two-impurity Kondo models

Phys. Rev. Lett. 108, 086405 (2012)

Andrew K. Mitchell, Eran Sela, David E. Logan


We consider the non-Fermi liquid quantum critical state of the spin-S two-impurity Kondo model, and its potential realization in a quantum dot device. Using conformal field theory (CFT) and the numerical renormalization group (NRG), we show the critical point to be identical to that of the two-channel Kondo model with additional potential scattering, for any spin-S. Distinct conductance signatures are shown to arise as a function of device asymmetry; with the 'smoking gun' square-root behavior, commonly believed to arise at low-energies, dominant only in certain regimes.


Two-channel Kondo physics in two-impurity Kondo models

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