期刊
NANO LETTERS
卷 21, 期 1, 页码 230-235出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c03579
关键词
graphene; antiferromagnetic; Mott insulator; circular dichroism Hall effect
类别
资金
- US Department of Energy-Basic Energy Sciences [DE-FG02-04ER46148]
By using first-principles calculations, the electronic and topological properties of an antiferromagnetic superatomic graphene lattice on a bipartite honeycomb lattice have been investigated. The material displays a Dirac Mott insulating state with a gap opening at the Dirac point due to long-range antiferromagnetic order, and shows a circular dichroism Hall effect with opposite directions of transversal Hall currents for left- and right-handed circularly polarized light.
Using first-principles calculations, we investigate the electronic and topological properties of an antiferromagnetic (AFM) superatomic graphene lattice superimposed on a bipartite honeycomb lattice governed by Lieb's theorem of itinerant magnetism. It affords a concrete material realization of the AFM honeycomb model with a Dirac Mott insulating state, characterized by a gap opening at the Dirac point due to inversion symmetry breaking by long-range AFM order. The opposite Berry curvatures of the K and K' valleys induces a circular dichroism (CD) Hall effect. Different from the valley Hall effect that activates only one valley, the CD Hall effect activates carriers from both K and K' valleys, generating the opposite directions of transversal Hall currents for the left- and right-handed circularly polarized light, respectively.
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