Magnetic Field Universality of the Kondo Effect Revealed by Thermocurrent Spectroscopy

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.

Published version, including Supplementary Material main text:6 pages, 4 figures. SI: 55 pages, 22 figures

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• Role of bias and tunneling asymmetries in nonlinear Fermi-liquid transport through an SU($N$) quantum dot
• Thermoelectric transport and current noise through a multilevel Anderson impurity: Three-body Fermi-liquid corrections in quantum dots and magnetic alloys
• Implementation of SNS thermometers into molecular devices for cryogenic thermoelectric experiments
• Kondo Temperature Evaluated from Linear Conductance in Magnetic Fields
• Three-body Fermi liquid corrections for an infinite-$U$ SU($N$) Anderson impurity model
• Thermodynamic and energetic constraints on transition probabilities of small-scale quantum systems
• Three-body Fermi-liquid corrections for Andreev transport through quantum dots