Zheng Liu, Zheng-Fei Wang, Jia-Wei Mei, Yong-Shi Wu, Feng Liu
Discoveries of unconventional band structures in solid-state materials, such as graphene and topological insulators, have inspired a wide spectrum of theoretical advances and technological innovations. By combining exotic band dispersion with nontrivial band topology, an interesting type of band, namely the topological flat band (TFB), has recently been proposed, in which carriers experience strong Coulomb interaction as well as topological frustration that in together spawn unprecedented topological many-body electronic states, i.e. high-temperature fractional quantum hall state. Despite the proposal of several theoretical lattice models, however, it remains a doubt whether such a "romance of flatland" could exist in a real material, which requires a delicate balance of (1) lattice geometry, (2) spin-orbit coupling (SOC) and (3) ferromagnetism. Here, we present a first-principles design to fulfill all three requirements in a two-dimensional (2D) Indium-Phenylene Organometallic Framework (IPOF) that realizes a nearly flat topological band right around the Fermi level. Our design in addition provides a general strategy to synthesize topologically nontrivial materials in virtue of organic chemistry and nanotechnology.
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http://arxiv.org/abs/1210.1826
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