Transport Characterization of Kondo-Correlated Single Molecule Devices

Abstract

A single molecule break junction device serves as a tunable model system for probing the many body Kondo state. The low-energy properties of this state are commonly described in terms of a Kondo model, where the response of the system to different perturbations is characterized by a single emergent energy scale, k_B*T_K. Comparisons between different experimental systems have shown issues with numerical consistency. With a new constrained analysis examining the dependence of conductance on temperature, bias, and magnetic field simultaneously, we show that these deviations can be resolved by properly accounting for background, non-Kondo contributions to the conductance that are often neglected. We clearly demonstrate the importance of these non-Kondo conduction channels by examining transport in devices with total conductances exceeding the theoretical maximum due to Kondo-assisted tunneling alone.

9 pages, 4 figures

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Cited by in corpus (7)

• Green's function methods for single molecule junctions
• Time evolution of the Kondo resonance in response to a quench
• Perfect spin filter by periodic drive of a ferromagnetic quantum barrier
• Time-dependent numerical renormalization group method for multiple quenches: towards exact results for the long time limit of thermodynamic observables and spectral functions
• Temperature Induced Shifts of Yu-Shiba-Rusinov Resonances in Nanowire-Based Hybrid Quantum Dots
• Scaling of conductance through quantum dots with magnetic field
• The renormalized superperturbation theory (SPT) approach to the Anderson model in and out of equilibrium