Magnetic-Field Universality of the Kondo Effect Revealed by Thermocurrent Spectroscopy

Hsu, Chunwei;Costi, Theo A.;Vogel, David;Wegeberg, Christina;Gehring, Pascal;et.al.
(2022) Physical Review Letters — Vol. 128, n° 14, p. 1-16 (2022)

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Authors
  • Hsu, Chunweiorcid-logoKavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, Delft 2628 CJ, The Netherlands
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  • Costi, Theo A.orcid-logoPeter Gr¨unberg Institut, Forschungszentrum J¨ulich, 52425 J¨ulich, Germany - Institute for Advanced Simulation, Forschungszentrum J¨ulich, 52425 J¨ulich, Germany
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  • Vogel, Davidorcid-logoDepartment of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland
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  • Wegeberg, Christinaorcid-logoDepartment of Chemistry, University of Basel, St. Johanns-Ring 19, 4056 Basel, Switzerland
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  • Gehring, Pascalorcid-logoUCLouvain
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Abstract
Probing the universal low-temperature magnetic-field scaling of Kondo-correlated quantum dots via electrical conductance has proved to be experimentally challenging. Here, we show how to probe this in nonlinear thermocurrent spectroscopy applied to a molecular quantum dot in the Kondo regime. Our results demonstrate that the bias-dependent thermocurrent is a sensitive probe of universal Kondo physics, directly measures the splitting of the Kondo resonance in a magnetic field, and opens up possibilities for investigating nanosystems far from thermal and electrical equilibrium.
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Hsu, C., Costi, T. A., Vogel, D., Wegeberg, C., Mayor, M., van der Zant, H. S.  J., & Gehring, P. (2022). Magnetic-Field Universality of the Kondo Effect Revealed by Thermocurrent Spectroscopy. Physical Review Letters, 128(14), 1-16. https://doi.org/10.1103/physrevlett.128.147701 (Original work published 2022)