Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Topological odd-parity superconductors   In this letter, we investigate topological phases of full-gapped odd-parity
superconductors, which are distinguished by the bulk topological invariants and
the topologically protected gapless boundary states. Using the particle-hole
symmetry, we introduce Z_2 invariants characterizing topological odd-parity
superconductors without or with time-reversal invariance. For odd-parity
superconductors, a combination of the inversion and the U(1) gauge symmetry is
manifestly preserved, and the combined symmetry enables us to evaluate the Z_2
invariants from the knowledge of the Fermi surface structure. Relating the Z_2
invariants to other topological invariants, we establish characterization of
topological odd-parity superconductors in terms of the Fermi surface topology.
Simple criteria for topological odd-parity superconductors in various
dimensions are provided. Implications of our formulas for nodal odd-parity
superconductors are also discussed.

9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg