Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Simple Models for All Topological Phases   We construct simple models for all topological phases of free fermions. These
explicit models can realize all the nontrivial topological phases (with any
possible topological invariant) of the periodic table. Many well known models
for topological insulators and superconductors are special cases of our general
constructions.

13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th