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.

arXiv comment11 pages in PRB format

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• Universal Fermi liquid crossover and quantum criticality in a mesoscopic device
• Density matrix numerical renormalization group for non-Abelian symmetries
• Universal low-temperature crossover in two-channel Kondo models
• Exact crossover Green function in the two-channel and two-impurity Kondo models
• Two-channel Kondo phases and frustration-induced transitions in triple quantum dots
• Kondo blockade due to quantum interference in single-molecule junctions
• Two-channel Kondo physics in odd impurity chains
• Quantum thermoelectric and heat transport in the overscreened Kondo regime: Exact conformal field theory results
• Two-Channel Kondo Effects in Al/AlO${}_x$/Sc Planar Tunnel Junctions
• Spin thermopower in the overscreened Kondo model
• Dynamical correlations in the spin-half two-channel Kondo model
• Kondo effect in a quantum dot coupled to ferromagnetic leads and side-coupled to a nonmagnetic reservoir
• SO(5) critical point in a spin-flavor Kondo device -- Bosonization and refermionization solution
• Spin-resolved dynamical conductance of correlated large-spin magnetic molecules
• The thermal conductance of a two-channel Kondo model
• Dynamical spin accumulation in large-spin magnetic molecules
• Non-Hermitian Numerical Renormalization Group: Solution of the non-Hermitian Kondo model
• Signatures of Kondo-Majorana interplay in ac response
• Transport properties of a multichannel Kondo dot in a magnetic field