Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electronic structure, magnetism and high-temperature superconductivity
  in the multi-layer octagraphene and octagraphite   We systematically investigate the electronic structure, magnetism and
high-temperature superconductivity (SC) in the multi-layer octagraphene and
octagraphite (bulk octagraphene). A tight binding model is used to fit the
electronic structures of single-layer, multi-layer octagraphenes and
octagraphite. We find that the multi-layer octagraphene and octagraphite follow
a simple A-A stacking structure from the energy analysis. The van der Waals
interaction induces $t_{\perp}\approx0.25$ eV and the hopping integrals within
each layers changes little when the layer number $n$ increases. There is a well
Fermi-surface nesting with nesting vector $\mathbf{Q}=(\pi,\pi)$ for the
single-layer octagraphene at half-filling, which can induce a 2D N\'{e}el
antiferromagnetic order. With increasing the layer number $n\rightarrow\infty$,
the Fermi-surface nesting transforms to 3D with nesting vector
$\mathbf{Q}=(\pi,\pi,\pi)$ and shows the system has a 3D N\'{e}el
antiferromagnetic order. Upon doping, the multi-layer octagraphene and
octagraphite can enter a high-temperature $s^{\pm}$ SC driven by spin
fluctuation. We evaluate the superconducting transition temperature $T_c$ by
using the random-phase approximation (RPA), which yields a high $T_c$ even if
the layer number $n\geq$ 3. Our study shows that the multi-layer octagraphene
and octagraphite are promising candidates for realizing the high-temperature
SC.

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The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
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
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph