Partial Kondo Screening in Honeycomb Lattice
ORAL
Abstract
In this work, we study the Kondo lattice problem on honeycomb lattices using the large-N mean-field theory. Our numerical solutions to the self-consistent mean-field equations reveal that, depending on electron filling and Kondo interaction strength, the system can exhibit partial Kondo screening (PKS), where one sublattice shows finite Kondo coherence while the other exhibits magnetic (or charge) order without Kondo coherence. To explain this phenomenon, we construct a Ginzburg-Landau theory that identifies the general conditions favoring PKS, which can be applied to other bipartite lattices. Notably, the PKS phase breaks inversion symmetry, signifying a genuine second-order phase transition at the onset of the Kondo coherence. These results go beyond the conventional Doniach phase diagram and offer some insights into Kondo physics in bipartite lattice systems.
*The work was carried out under the auspices of the U.S. DOE NNSA under contract No. 89233218CNA000001 through the LDRD Program, and was supported by the Center for Nonlinear Studies at LANL, and was performed, in part, at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. DOE Office of Science, under user proposals #2018𝐵𝑈0010 and #2018𝐵𝑈0083.
–
Presenters
-
Hao Zhang
- Los Alamos National Laboratory (LANL)