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.

arXiv comment5 pages, 4 figures

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Cited by in corpus (31)

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• Quantum Fluctuations along Symmetry Crossover in Kondo-correlated Quantum Dot
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• Configuration interaction based nonequilibrium steady state impurity solver
• Non-Hermitian quantum impurity systems in and out of equilibrium: noninteracting case
• Lead Geometry and Transport Statistics in Molecular Junctions
• Nonequilibrium Kondo effect in a magnetic field: Auxiliary master equation approach
• Emission Noise in an Interacting Quantum Dot: Role of Inelastic Scattering and Asymmetric Coupling to the Reservoirs
• Thermoelectric Transport through SU(N) Kondo Impurity
• Enhanced shot noise of multiple Andreev reflections in a carbon nanotube quantum dot in SU(2) and SU(4) Kondo regimes
• Nonlinear Seebeck effect of SU($N$) Kondo impurity
• Fabry-Pérot oscillations in correlated carbon nanotubes
• Spin-isospin Kondo effects for ${\Sigma }_c$ and ${\Sigma }_c^{\ast }$ baryons and $\bar{D}$ and ${\bar{D}}^{\ast }$ mesons
• Field-induced SU(4) to SU(2) Kondo crossover in a half-filling nanotube dot: spectral and finite-temperature properties
• Three-body correlations in nonlinear response of correlated quantum liquid
• Finite frequency current noise in the Holstein model
• Nonlinear Fermi-liquid transport through a quantum dot in asymmetric tunnel junctions
• Intra- and inter-shell Kondo effects in carbon nanotube quantum dots
• Noise of a chargeless Fermi liquid
• On the Sign of Fermion-Mediated Interactions
• Role of bias and tunneling asymmetries in nonlinear Fermi-liquid transport through an SU($N$) quantum dot
• Quantum noise in carbon nanotubes as a probe of correlations in the Kondo regime
• Real-time propagation of adaptive sampling selected configuration interaction wave function
• Selective tuning of spin-orbital Kondo contributions in parallel-coupled quantum dots
• Kondo Temperature Evaluated from Linear Conductance in Magnetic Fields
• Unhiding a concealed resonance by multiple Kondo transitions in a quantum dot
• Observation of field-induced single-ion magnetic anisotropy in a multiorbital Kondo alloy $(\mathrm{Lu},\mathrm{Yb}){\mathrm{Rh}}_2{\mathrm{Zn}}_{20}$
• Current cross-correlation in the Anderson impurity model with exchange interaction
• Non-symmetrized quantum noise in a Kondo quantum dot
• Bell-state correlations in current of local Fermi liquid
• Fractional shot noise of an SU(N) Kondo system