Three-body correlations in nonlinear response of correlated quantum liquid
Tokuro Hata, Yoshimichi Teratani, Tomonori Arakawa, Sanghyun Lee, Meydi Ferrier, Richard Deblock, Rui Sakano, Akira Oguri, Kensuke Kobayashi
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.