Quantum Fluctuations along Symmetry Crossover in Kondo-correlated Quantum Dot

Abstract

Universal properties of entangled many-body states are controlled by their symmetry and quantum fluctuations. By magnetic-field tuning of the spin-orbital degeneracy in a Kondo-correlated quantum dot, we have modified quantum fluctuations to directly measure their influence on the many-body properties along the crossover from $SU(4)$ to $SU(2)$ symmetry of the ground state. High-sensitive current noise measurements combined with the non-equilibrium Fermi liquid theory clarify that the Kondo resonance and electron correlations are enhanced as the fluctuations, measured by the Wilson ratio, increase along the symmetry crossover. Our achievement demonstrates that non-linear noise constitutes a measure of quantum fluctuations that can be used to tackle quantum phase transitions.

5 pages, 4 figures

References in corpus (9)

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• The Kondo crossover in shot noise of a single quantum dot with orbital degeneracy
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Cited by in corpus (10)

• Shot Noise in Mesoscopic Systems: from Single Particles to Quantum Liquids
• Quantum Fluctuations along Symmetry Crossover in Kondo-correlated Quantum Dot
• Configuration interaction based nonequilibrium steady state impurity solver
• Lead Geometry and Transport Statistics in Molecular Junctions
• Three-body correlations in nonlinear response of correlated quantum liquid
• Role of bias and tunneling asymmetries in nonlinear Fermi-liquid transport through an SU($N$) quantum dot
• Real-time propagation of adaptive sampling selected configuration interaction wave function
• Kondo Temperature Evaluated from Linear Conductance in Magnetic Fields
• Observation of field-induced single-ion magnetic anisotropy in a multiorbital Kondo alloy $(\mathrm{Lu},\mathrm{Yb}){\mathrm{Rh}}_2{\mathrm{Zn}}_{20}$
• Fractional shot noise of an SU(N) Kondo system