Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Flat Chern Band in a Two-Dimensional Organometallic Framework   By combining exotic band dispersion with nontrivial band topology, an
interesting type of band structure, namely the flat chern band (FCB), has
recently been proposed to spawn high-temperature fractional quantum hall
states. 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. Here, we present a first-principles design of a two-dimensional (2D)
Indium-Phenylene Organometallic Framework (IPOF) that realizes a nearly FCB
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 in virtue of organic
chemistry and nanotechnology.

6
The categories of this paper are: astro-ph
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The categories of this paper are: solv-int
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
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The categories of this paper are: gr-qc
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
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The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph