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Transport characterization of Kondo-correlated single-molecule devices

G. D. Scott, D. Natelson, S. Kirchner, and E. Muñoz
Phys. Rev. B 87, 241104(R) – Published 21 June 2013
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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, kBTK. 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.

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  • Received 18 December 2012

DOI:https://doi.org/10.1103/PhysRevB.87.241104

©2013 American Physical Society

Authors & Affiliations

G. D. Scott1,*, D. Natelson2, S. Kirchner3,4, and E. Muñoz5

  • 1Bell Laboratories, Alcatel-Lucent, 600 Mountain Avenue, Murray Hill, New Jersey 07974, USA
  • 2Department of Physics and Astronomy and Department of Computer and Electrical Engineering, Rice University, 6100 Main Street, Houston, Texas 77005, USA
  • 3Max Planck Institute for the Physics of Complex Systems, 01187 Dresden, Germany
  • 4Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
  • 5Facultad de Física, Pontificia Universidad Católica de Chile, Casilla 306, Santiago 22, Chile

  • *gavin.scott@alcatel-lucent.com

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Issue

Vol. 87, Iss. 24 — 15 June 2013

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