Observation of the Kondo effect in a quadruple quantum dot

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.

Photon assisted electron transport through T-shaped double quantum dot molecule A–B interferometer

“…5. The phenomenon is similar to 13 that of parallel double quantum dot A-B interferometer [18] . It means that partial transport properties through parallel double quantum dot A-B interferometer are preserved.…”

“…Within nanometer physical length, quantum dot system is studied, and find many new, unique and meaningful physical properties, such as quantum interference [1,2] , quantum Hall effect [3] , Aharonov-Bohm (A-B) effect [4,5] , Fano effect [6][7][8] , Kondo effect [9,10] , thermoelectric effect [11,12] , Photon assisted tunneling effect [13,14] , and so on.…”

Transport properties of proximitized double quantum dots

“…When the second dot (QD 2 ) is side coupled to the first one, there is a possibility to obtain the Fano-like asymmetric line shapes in the linear conductance [3][4][5][6][7]14] which are obtained as a result of the interference between discrete QD 2 level with a broad band of QD 1 . Additionally, for interacting dots, one obtains a two-stage Kondo effect [2,3,14,29,30]. The Fano destructive interference partially suppresses the Kondo resonance.…”