Programme

P.4 -- Poster, NCTP-43

Date: Tuesday, 31 July 2018

Time: 08:30 - 10:00

Selective Kondo strong coupling in magnetic impurity flat-band lattices

Nguyễn Dương Bo1, Trần Thị Thanh Mai 2, Nguyễn Thị Thủy 3, and Trần Minh Tiến 1,3

1. Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Hanoi 100000, Vietnam 2. Faculty of Physics, Hanoi National Education University, Hanoi 100000, Vietnam 3. Institute of Physics, Vietnam Academy of Science and Technology, Hanoi 100000, Vietnam

Abstract The periodic Anderson model in the Lieb lattice is studied by the slave-boson mean-field approximation in the strong interaction limit. The electron structure of conduction electrons on the Lieb lattice features both the band flatness and the Dirac linear dispersion at low energy. These features give rise to a competition between the soft-gap and the molecular Kondo effects in the lattice. We find a selective Kondo strong coupling, which occurs between the full local moment and the strong coupling regimes, and yields an effective lattice depletion due to the correlation effect. In the selective Kondo strong coupling regime, the magnetic impurities at the selected sites are strongly coupled to conduction electrons, while at the remaining sites they are decoupled. At low temperature the selection of the Kondo strong coupling is always dominant at those lattice sites where the local density of states has the flat-band feature regardless of the impurity parameters. Rich phase diagrams for different model parameters are obtained.

Presenter: Nguyen Duong Bo