Kondo physics in the T-shaped structure with two detuned quantum dots

The Kondo effect in the T-shaped double-quantum-dot structure is theoretically investigated, by considering different adjustments of the quantum dot levels. It is shown that when the quantum dot levels are shifted to the electron-hole symmetry point, the two-stage Kondo effect can be induced at the limit of weak interdot coupling. However, with the increase of interdot coupling, the interdot antiferromagnetic correlation modifies the Kondo effect efficiently, leading to the destruction of the conductance plateau. If the dot levels are detuned, the low-temperature entropy transition will exhibit new results and complicated transport behaviors occur. The reason also arises from the competition between the Kondo effect and the interdot antiferromagnetic correlation. We believe that these results are helpful for the further understanding of the Kondo physics in the T-shaped double-dot structure.

Automated summary

The theoretical investigation of the Kondo effect in the T-shaped double-quantum-dot structure shows that a two-stage Kondo effect can be induced when the quantum dot levels are shifted to the electron-hole symmetry point. However, increasing interdot coupling can efficiently modify the Kondo effect, leading to the destruction of the conductance plateau. Detuning the dot levels can result in new low-temperature entropy transitions and complex transport behaviors due to the competition between the Kondo effect and the interdot antiferromagnetic correlation.