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Chern insulator with a nearly flat band in the metal-organic-framework-based Kagome lattice.
- Source :
- Scientific Reports; 9/24/2019, Vol. 9 Issue 1, pN.PAG-N.PAG, 1p
- Publication Year :
- 2019
-
Abstract
- Based on first-principles density-functional theory (DFT) calculations, we report that the transition-metal bis-dithiolene, M<subscript>3</subscript>C<subscript>12</subscript>S<subscript>12</subscript> (M = Mn and Fe), complexes can be a two-dimensional (2D) ferromagnetic insulator with nontrivial Chern number. Among various synthetic pathways leading to metal bis-dithiolenes, the simplest choice of ligand, Benzene-hexathiol, connecting metal cations to form a Kagome lattice is studied following the experimental report of time-reversal symmetric isostructural compound Ni<subscript>3</subscript>C<subscript>12</subscript>S<subscript>12</subscript>. We show sulfur and carbon-based ligands play the key role in making the complexes topologically nontrivial. An unusual topological quantum phase transition induced by the on-site Coulomb interaction brings a nearly flat band with a nonzero Chern number as the highest occupied band. With this analysis we explain the electronic structure of the class M<subscript>3</subscript>C<subscript>12</subscript>S<subscript>12</subscript> and predict the existence of nearly flat band with nonzero Chern number and it can be a fractional Chern insulator candidate with carrier doping. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20452322
- Volume :
- 9
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Scientific Reports
- Publication Type :
- Academic Journal
- Accession number :
- 138792675
- Full Text :
- https://doi.org/10.1038/s41598-019-50163-7