Zero-field Kondo splitting and quantum-critical transition in double quantum dots

Abstract

Double quantum dots offer unique possibilities for the study of many-body correlations. A system containing one Kondo dot and one effectively noninteracting dot maps onto a single-impurity Anderson model with a structured (nonconstant) density of states. Numerical renormalization-group calculations show that while band filtering through the resonant dot splits the Kondo resonance, the singlet ground state is robust. The system can also be continuously tuned to create a pseudogapped density of states and access a quantum critical point separating Kondo and non-Kondo phases.

4 pages, 4 figures; Accepted for publication in Physical Review Letters

References in corpus (6)

• Phase transitions in the pseudogap Anderson and Kondo models: Critical dimensions, renormalization group, and local-moment criticality
• Quantum phase transition in capacitively coupled double quantum dots
• Quantum phase transition in a two-channel-Kondo quantum dot device
• Transport through quantum dots in mesoscopic circuits
• Transport Spectroscopy of a Kondo quantum dot coupled to a finite size grain
• Spectral densities of Kondo impurities in nanoscopic systems

Cited by in corpus (15)

• The numerical renormalization group method for quantum impurity systems
• Quantum phase transitions in the systems of parallel quantum dots
• Kondo-Dicke resonances in electronic transport through triple quantum dots
• Many-body electronic structure and Kondo properties of cobalt-porphyrin molecules
• Kondo physics and dissipation: A numerical renormalization-group approach to Bose-Fermi Kondo models
• Spectral density of an interacting dot coupled indirectly to conducting leads
• Tunable pseudogap Kondo effect and quantum phase transitions in Aharonov-Bohm interferometers
• Finite-temperature conductance signatures of quantum criticality in double quantum dots
• Features of spin-charge separation in the equilibrium conductance through finite rings
• Thermal dependence of the zero-bias conductance through a nanostructure
• Quantum phase transitions in a resonant-level model with dissipation: Renormalization-group studies
• Electrostatic control of quantum dot entanglement induced by coupling to external reservoirs
• Transport Properties of Multiple Quantum Dots Arranged in Parallel: Results from the Bethe Ansatz
• Transmission in double quantum dots in the Kondo regime: Quantum-critical transitions and interference effects
• Zero temperature conductance of parallel T-shape double quantum dots