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Transport characterization of Kondo-correlated single-molecule devices

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Kirchner,  S.
Stefan Kirchner, cross-PKS/CPfS theory group, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Scott, G. D., Natelson, D., Kirchner, S., & Munoz, E. (2013). Transport characterization of Kondo-correlated single-molecule devices. Physical Review B, 87(24): 241104, pp. 241104-1-241104-6. doi:10.1103/PhysRevB.87.241104.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0015-1E9E-F
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.