Observation of Kondo Effect in a Quadruple Quantum Dots

Abstract

We investigate the Kondo effect in a quadruple quantum dot device of coupled-double quantum dots (DQDs), which simultaneously contains intra-DQDs and inter-DQDs coupling. A variety of novel behaviors are observed. The differential conductance dI/dV is measured in the upper DQDs as a function of source drain bias. It is found to exhibit multiple peaks, including a zero-bias peak, where the number of peaks exceeds five. Alternatively, tuning the lower DQDs yielded regions of four peaks. In addition, a Kondo-effect switcher is demonstrated, using the lower DQDs as the controller.

14 pages including 5 figures

References in corpus (7)

• Demonstration of Entanglement of Electrostatically Coupled Singlet-Triplet Qubits
• Observation of the two-channel Kondo effect
• Quantum criticality in a double quantum-dot system
• Quantum phase transition in capacitively coupled double quantum dots
• Quantum phase transition of Ising-coupled Kondo impurities
• Photon-assisted-tunneling in a coupled double quantum dot out of thermal equilibrium
• Kondo Effect in Mesoscopic Quantum Dots

Cited by in corpus (4)

• Local magnetic moments and electronic transport in closed loop quantum dot systems: a case of quadruple quantum dot ring at and away from equilibrium
• Transport properties of proximitized double quantum dots
• Spin-polarized transport in quadruple quantum dots attached to ferromagnetic leads
• Exact diagonalization study of double quantum dots in parallel geometry in zero-bandwidth limit