Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multiple Andreev reflection and critical current in topological
  superconducting nanowire junctions   We study transport in a voltage biased superconductor-normal-superconductor
(SNS) junction made of semiconducting nanowires with strong spin-orbit
coupling, as it transitions into a topological superconducting phase for
increasing Zeeman field. Despite the absence of a fractional steady-state ac
Josephson current in the topological phase, the dissipative multiple Andreev
reflection (MAR) current I_dc at different junction transparencies is
particularly revealing. It exhibits unique features related to topology, such
as the gap inversion, the formation of Majorana bound states, and
fermion-parity conservation. Moreover, the critical current I_c, which
remarkably does not vanish at the critical point where the system becomes
gapless, provides direct evidence of the topological transition.

30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol