Universal Scaling in Non-equilibrium Transport Through a Single-Channel Kondo Dot

TL;DR

This paper demonstrates that non-equilibrium transport through a single-channel Kondo quantum dot exhibits universal scaling behavior, consistent with theoretical predictions for the spin-1/2 Kondo effect, using low-temperature and bias measurements.

Contribution

The study provides experimental evidence of universal scaling laws in non-equilibrium Kondo transport, confirming theoretical models with precise measurements.

Findings

Kondo conductance follows universal scaling between temperature and bias

Transport data fits a universal scaling function with two parameters

Quadratic scaling exponent observed for low-energy Kondo behavior

Abstract

Scaling laws and universality play an important role in our understanding of critical phenomena and the Kondo effect. Here we present measurements of non-equilibrium transport through a single-channel Kondo quantum dot at low temperature and bias. We find that the low-energy Kondo conductance is consistent with universality between temperature and bias and characterized by a quadratic scaling exponent, as expected for the spin-1/2 Kondo effect. The non-equilibrium Kondo transport measurements are well-described by a universal scaling function with two scaling parameters.