Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dichotomy in short superconducting nanowires: thermal phase slippage vs.
  Coulomb blockade   Quasi-one-dimensional superconductors or nanowires exhibit a transition into
a nonsuperconducting regime, as their diameter shrinks. We present measurements
on ultrashort nanowires (~40-190 nm long) in the vicinity of this quantum
transition. Properties of all wires in the superconducting phase, even those
close to the transition, can be explained in terms of thermally activated phase
slips. The behavior of nanowires in the nonsuperconducting phase agrees with
the theories of the Coulomb blockade of coherent transport through mesoscopic
normal metal conductors. Thus it is concluded that the quantum transition
occurs between two phases: a "true superconducting phase" and an "insulating
phase". No intermediate, "metallic" phase was found.

37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph