Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-local transport in normal-metal/superconductor hybrid structures:
  the role of interference and interaction   We have measured local and non-local conductance of mesoscopic
normal-metal/superconductor hybrid structures fabricated by e-beam lithography
and shadow evaporation. The sample geometry consists of a superconducting
aluminum bar with two normal-metal wires forming tunnel contacts to the
aluminum at distances of the order of the superconducting coherence length. We
observe subgap anomalies in both local and non-local conductance that quickly
decay with magnetic field and temperature. For the non-local conductance both
positive and negative signs are found as a function of bias conditions,
indicating at a competition of crossed Andreev reflection and elastic
cotunneling. Our data suggest that the signals are caused by a phase-coherent
enhancement of transport rather than dynamical Coulomb blockade.

31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int