Three-body correlations in nonlinear response of correlated quantum liquid

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.

Magnetic Field Universality of the Kondo Effect Revealed by Thermocurrent Spectroscopy

“…The results show that c V and c T are universal functions of magnetic field which change sign at a universal crossover field B = B c describing the onset of the splitting of the Kondo resonance in dI/dV sd , in agreement with predictions for B c for the Kondo model [28]. Nevertheless, as we shall explain in more detail below, establishing this universality and the splitting of the Kondo resonance in dI/dV sd is intrinsically difficult [29][30][31][32]. Yet, both serve as useful experimental hallmarks of the Kondo effect in quantum dots.…”

Magnetic-Field Universality of the Kondo Effect Revealed by Thermocurrent Spectroscopy

“…The results show that c V and c T are universal functions of magnetic field which change sign at a universal crossover field B ¼ B c describing the onset of the splitting of the Kondo resonance in dI=dV sd , in agreement with predictions for B c for the Kondo model [68]. Nevertheless, establishing this universality and the splitting of the Kondo resonance in dI=dV sd is intrinsically difficult [69][70][71][72]. Yet, both serve as useful experimental hallmarks of the Kondo effect in quantum dots.…”

Shot Noise in Mesoscopic Systems: from Single Particles to Quantum Liquids

“…( 77) [199,[201][202][203][204][205][206][207][208]. Several experiments have also been reported [9,36,[209][210][211][212][213][214]. Such studies are an essential step towards understanding the Fermi liquid in the non-equilibrium regime.…”