Abstract
Heat transport and dissipation at the nanoscale severely limit the scaling of high-performance electronic devices and circuits1. Metallic atomic junctions serve as model systems to probe electrical and thermal transport down to the atomic level as well as quantum effects that occur in one-dimensional (1D) systems2. Whereas charge transport in atomic junctions has been studied intensively in the past two decades2,3,4,5, heat transport remains poorly characterized because it requires the combination of a high sensitivity to small heat fluxes and the formation of stable atomic contacts. Here we report heat-transfer measurements through atomic junctions and analyse the thermal conductance of single-atom gold contacts at room temperature. Simultaneous measurements of charge and heat transport reveal the proportionality of electrical and thermal conductance, quantized with the respective conductance quanta6. This constitutes a verification of the Wiedemann–Franz law at the atomic scale7.
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Acknowledgements
We acknowledge funding by the European Commission FP7 ITN ‘MOLESCO’ Project No. 606728. We thank J. Repp, K. Moselund and W. Riess for management support of the project. We acknowledge technical support from M. Tschudy, H. Wolf, E. Lörtscher, S. Reidt, A. Olziersky, G. Meyer and C. Bolliger. We thank C. Lambert, H. Sadeghi, G. Signorello, F. Motzfeld, J. Gooth and all the MOLESCO partners for fruitful discussions concerning this work. This work is dedicated to the MOLESCO partner T. Wandlowski.
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B.G. and N.M. conceived the experiment. N.M. performed the measurements with the help of P.N., S.K., F.M. and B.G. The MEMS devices were fabricated by U.D. The experiment was designed by B.G., N.M. and F.M. N.M. and B.G. performed the data analysis and wrote the manuscript with contributions by all the authors. All the authors discussed the results.
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Mosso, N., Drechsler, U., Menges, F. et al. Heat transport through atomic contacts. Nature Nanotech 12, 430–433 (2017). https://doi.org/10.1038/nnano.2016.302
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DOI: https://doi.org/10.1038/nnano.2016.302
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