Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Re-entrance of the metallic conductance in a mesoscopic proximity
  superconductor   We present an experimental study of the diffusive transport in a normal metal
near a superconducting interface, showing the re-entrance of the metallic
conductance at very low temperature. This new mesoscopic regime comes in when
the thermal coherence length of the electron pairs exceeds the sample size.
This re-entrance is suppressed by a bias voltage given by the Thouless energy
and can be strongly enhanced by an Aharonov Bohm flux. Experimental results are
well described by the linearized quasiclassical theory.

21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph