1. Flat Chern Band in a Two-Dimensional Organometallic Framework.
- Author
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Zheng Liu, Wang, Zheng-Fei, Mei, Jia-Wei, Wu, Yong-Shi, and Feng Liu
- Subjects
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ENERGY bands , *METAL-organic frameworks , *DISPERSION (Chemistry) , *HIGH temperatures , *QUANTUM Hall effect , *PHENYLENE compounds , *FERROMAGNETISM , *NANOTECHNOLOGY - Abstract
By combining exotic band dispersion with nontrivial band topology, an interesting type of band structure, namely, the flat Chern band, has recently been proposed to spawn high-temperature fractional quantum Hall states. Despite the proposal of several theoretical lattice models, however, it remains doubtful whether such a "romance of flatland" could exist in a real material. Here, we present a first-principles design of a two-dimensional indium-phenylene organometallic framework that realizes a nearly flat Chern band right around the Fermi level by combining lattice geometry, spin-orbit coupling, and ferromagnetism. An effective four-band model is constructed to reproduce the first-principles results. Our design, in addition, provides a general strategy to synthesize topologically nontrivial materials by virtue of organic chemistry and nanotechnology. [ABSTRACT FROM AUTHOR]
- Published
- 2013
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