Antiferromagnetism and Kondo screening on a honeycomb lattice |
(a) Itinerant electrons moving on a honeycomb lattice coupling to the local spins on a parallel lattice. (b) Schematic picture of the periodic Anderson model. The periodic Anderson model delivers the Kondo lattice model in the large U limit with one f electron per site. (c) The vector a i , i = 1,2,3, are the nearest-neighbor displacements for site A to site B of the honeycomb lattice. (d) Quasiparticle dispersion with Dirac nodes in the Brillouin zone of the noninteracting electrons in the honeycomb lattice. |