Kondo effect in Lieb's minimal ferrimagnetic system on the T-shaped bipartite lattice

The minimal ferrimagnetism by Lieb's theorem emerges on the T-shaped bipartite lattice composed of four sites, which can be realized experimentally, just as Nagaoka ferromagnetism has been demonstrated experimentally using a quartet quantum dot [J. P. Dehollain et al., Nature (London) 579, 528 (2020)]. In this paper, the Kondo effect on this ferrimagnetism is theoretically studied. The magnetic moment S = 1 is screened in two steps by the Kondo effect and the series conductance gs is strongly suppressed to g(s) similar or equal to 0, while the parallel conductance gp has the maximum value g(p) similar or equal to 4e(2)/h. The robustness of these properties against a parameter change toward reducing the Lieb's ferrimagnetism is also discussed, showing the scenarios for entanglement of the degrees of freedom toward the ground state.

Automated summary

In this paper, the authors theoretically study the Kondo effect on the ferrimagnetism described by Lieb's theorem and discuss the robustness of these properties against parameter changes.