Magnetic Field Universality of the Kondo Effect Revealed by Thermocurrent Spectroscopy

TL;DR

This paper demonstrates that nonlinear thermocurrent spectroscopy can effectively probe the universal magnetic field scaling of the Kondo effect in quantum dots, revealing the splitting of the Kondo resonance and enabling studies far from equilibrium.

Contribution

It introduces a novel method using thermocurrent spectroscopy to investigate the magnetic field dependence of the Kondo effect in molecular quantum dots.

Findings

Thermocurrent is a sensitive probe of Kondo physics.

The method directly measures Kondo resonance splitting.

It allows exploration of nanosystems far from equilibrium.

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.