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

Abstract

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.

11 pages in PRB format

References in corpus (7)

• Observation of the two-channel Kondo effect
• Quantum criticality in a double quantum-dot system
• Quantum phase transition in a two-channel-Kondo quantum dot device
• Singlet-triplet transition in a lateral quantum dot
• Theory of inelastic scattering from quantum impurities
• Dissipation-induced quantum phase transition in a quantum box
• Coulomb blockade and Non-Fermi-liquid behavior in quantum dots

Cited by in corpus (4)

• Density matrix numerical renormalization group for non-Abelian symmetries
• Two-Channel Kondo Effects in Al/AlO${}_x$/Sc Planar Tunnel Junctions
• Dynamical correlations in the spin-half two-channel Kondo model
• The thermal conductance of a two-channel Kondo model