Magnetic-Field Universality of the Kondo Effect Revealed by Thermocurrent Spectroscopy
Chunwei Hsu (TU Delft - QN/van der Zant Lab)
Theo A. Costi (Forschungszentrum Jülich)
David Vogel (University of Basel)
Christina Wegeberg (University of Basel)
Marcel Mayor (University of Basel, Karlsruhe Institut für Technologie, Sun Yat-sen University)
Herre S.J. Van Der Zant (Kavli institute of nanoscience Delft, TU Delft - QN/van der Zant Lab)
Pascal Gehring (TU Delft - QN/van der Zant Lab, Université Catholique de Louvain, Kavli institute of nanoscience Delft)
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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.