Three-body correlations in nonlinear response of correlated quantum liquid

TL;DR

This paper experimentally demonstrates the importance of three-body correlations in the nonlinear conductance of a Kondo-correlated quantum liquid, extending the understanding of non-equilibrium quantum many-body physics beyond traditional two-body fluctuation-dissipation relations.

Contribution

It provides the first experimental validation of three-body correlations' role in nonlinear response in a quantum liquid, confirming recent theoretical extensions of Fermi liquid theory.

Findings

Three-body correlations significantly affect nonlinear conductance.

Experimental results validate extended Fermi liquid theory.

Nonlinear behavior observed at finite magnetic field.

Abstract

Behavior of quantum liquids is a fascinating topic in physics. Even in a strongly correlated case, the linear response of a given system to an external field is described by the fluctuation-dissipation relations based on the two-body correlations in the equilibrium. However, to explore nonlinear non-equilibrium behaviors of the system beyond this well-established regime, the role of higher order correlations starting from the three-body correlations must be revealed. In this work, we experimentally investigate a controllable quantum liquid realized in a Kondo-correlated quantum dot and prove the relevance of the three-body correlations in the nonlinear conductance at finite magnetic field, which validates the recent Fermi liquid theory extended to the non-equilibrium regime.