Ferromagnetic Kondo effect in a triple quantum dot system

Abstract

We propose that a simple device of three laterally-coupled quantum dots, the central one contacted by metal leads, can realize the ferromagnetic Kondo model, which is characterized by interesting properties like a non-analytic inverted zero-bias anomaly and an extreme sensitivity to a magnetic field. Furthermore, by tuning the gate voltages of the lateral dots, this device may allow to study the transition from ferromagnetic to antiferromagnetic Kondo effect, a simple case of a Berezinskii-Kosterlitz-Thouless transition. We model the device by three coupled Anderson impurities that we study by numerical renormalization group. We calculate the single-particle spectral function of the central dot, which at zero frequency is proportional to the zero-bias conductance, across the transition, both in the absence and in the presence of a magnetic field.

4 pages, 5 figures, revised version published in Phys. Rev. Lett

References in corpus (9)

• Mechanical Control of Spin States in Spin-1 Molecules and the Underscreened Kondo Effect
• Observation of the two-channel Kondo effect
• Sum-rule Conserving Spectral Functions from the Numerical Renormalization Group
• Energy resolution and discretization artefacts in the numerical renormalization group
• Coherent spin manipulation in an exchange-only qubit
• Kondo screening in a magnetically frustrated nanostructure: Exact results on a stable, non-Fermi-liquid phase
• Kondo-Dicke resonances in electronic transport through triple quantum dots
• Tunneling through triple quantum dots with mirror symmetry
• Suppression of Kondo screening by the Dicke effect in multiple quantum dots

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• Common non-Fermi liquid phases in quantum impurity physics
• Long-range Exchange Interaction in Triple Quantum Dots in the Kondo Regime
• Anisotropic charge Kondo effect in a triple quantum dot
• Global phase diagram of a spin-orbital Kondo impurity model and the suppression of Fermi-liquid scale
• Entanglement switching via the Kondo effect in triple quantum dots
• Transport through side-coupled multilevel double quantum dots in the Kondo regime
• Interplay between electron pairing and Dicke effect in triple quantum dots structures
• Reappearance of Kondo Effect in Serially Coupled Symmetric Triple Quantum Dots
• Manipulability of the Kondo effect in a T-shaped triple-quantum-dot structure
• Spin filtering and thermopower in star coupled quantum dot devices
• Frustrated Kondo impurity triangle: A simple model of deconfinement
• Magnetic Kondo regimes in a frustrated half-filled trimer
• Many-body wavefunctions for quantum impurities out of equilibrium. I. The nonequilibrium Kondo model
• Spin-1 two-impurity Kondo problem on a lattice
• Ferromagnetic and underscreened Kondo behavior in quantum dot arrays
• Observation of Kondo Effect in a Quadruple Quantum Dots
• Many-body wavefunctions for quantum impurities out of equilibrium
• Dynamics of symmetry breaking during quantum real-time evolution in a minimal model system
• Zero-field splitting of the Kondo resonance and quantum criticality in triple quantum dots
• Long-range Entanglement of Kondo Clouds in Open Triple Quantum Dots
• Frustration-enhanced persistent currents in correlated trimer nanorings
• Mechanical dissipation at a tip-induced Kondo onset
• Exact ground state for the four-electron problem in a 2D finite honeycomb lattice