Manipulability of the Kondo effect in a T-shaped triple-quantum-dot structure

We theoretically investigate the Kondo effect of a T-shaped triple-quantum-dot structure, by means of the numerical renormalization group method. It is found that the system's entropy and conductance have opportunities to exhibit abundant transition processes for different interdot-coupling manners, with the decrease of temperature. All these results are caused by different Kondo physics mechanisms. Moreover, in the presence of appropriate parameters, the three-stage Kondo effect comes into being. Next when the electron-hole symmetry is broken or the structural parameters are changed, the Kondo resonance can also be observed in the conductance spectrum. However, it shows alternative dependence on the relevant quantities, i.e., the Coulomb interaction and interdot couplings. All these phenomena exhibit interesting Kondo physics in this system. We believe that this work can be helpful for further understanding of the Kondo effect in the triple-quantum-dot structures.