Long-range Exchange Interaction in Triple Quantum Dots in the Kondo Regime

Abstract

Long-range interactions in triple quantum dots (TQDs) in Kondo regime are investigated by accurately solving the three-impurity Anderson model. For the occupation configuration of (N1,N2,N3) = (1, 0, 1), a long-range antiferromagnetic exchange interaction (JAF) is demonstrated and induces a continuous phase transition from the separated Kondo singlet (KS) to the long-range spin singlet (LSS) state between edge dots. The expression of JAF is analytically derived and numerically verified, according to which JAF can be conveniently manipulated via gate control of the detuning energy. The long-range entanglement of Kondo clouds are proved to be quite robust at strong inter-dot coupling limit. Under equilibrium condition, it induces an unexpected peak in the spectral function of the middle dot whose singly occupied level keeps much higher than the Fermi level. Under nonequilibrium condition, higher inter-dot tunneling barrier induces an anomalous enhancement of current. These novel features can be observed in routine experiments.

7 pages, 5 figures

References in corpus (12)

• An electrostatically defined serial triple quantum dot charged with few electrons
• Hierarchical Liouville-space approach for accurate and universal characterization of quantum impurity systems
• Two path transport measurements on a triple quantum dot
• Quantum criticality in a double quantum-dot system
• The 3D transport diagram of a triple quantum dot
• Fermi-liquid versus non-Fermi-liquid behavior in triple quantum dots
• Tunneling through triple quantum dots with mirror symmetry
• Macroscopic Quantum Entanglement of a Kondo Cloud at Finite Temperature
• Time-Dependent Transport Through Quantum-Impurity Systems with Kondo Resonance
• Suppression of Kondo screening by the Dicke effect in multiple quantum dots
• Two-channel Kondo tunneling in triple quantum dot
• Reappearance of Kondo Effect in Serially Coupled Symmetric Triple Quantum Dots

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• Current-induced dissociation in molecular junctions beyond the paradigm of vibrational heating: The role of anti-bonding electronic states
• Transport properties in a Non-Hermitian triple-quantum-dot structure
• Low-Error Operation of Spin Qubits with Superexchange Coupling
• Dark states in spin-polarized transport through triple quantum dot molecules
• Precise simulation for single-hole spin control in semiconductor quantum dots
• Long-range Entanglement of Kondo Clouds in Open Triple Quantum Dots
• Coherent time-dependent oscillations and temporal correlations in triangular triple quantum dots