Dynamical conductance in the two-channel Kondo regime of a double dot system

Details Dynamical conductance in the two-channel Kondo regime of a double dot system Dynamical conductance in the two-channel Kondo regime of a double dot system

2007-06-12

arxiv.org/abs/0706.1558v1

Phys. Rev. B 76, 155318 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages in PRB format

Scientific paper

10.1103/PhysRevB.76.155318

We study finite-frequency transport properties of the double-dot system recently constructed to observe the two-channel Kondo effect [R. M. Potok et al., Nature 446, 167 (2007)]. We derive an analytical expression for the frequency-dependent linear conductance of this device in the Kondo regime. We show how the features characteristic of the 2-channel Kondo quantum critical point emerge in this quantity, which we compute using the results of conformal field theory as well as numerical renormalization group methods. We determine the universal cross-over functions describing non-Fermi liquid vs. Fermi liquid cross-overs and also investigate the effects of a finite magnetic field.

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