Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nb/InAs nanowire proximity junctions from Josephson to quantum dot
  regimes   The superconducting proximity effect is probed experimentally in Josephson
junctions fabricated with InAs nanowires contacted by Nb leads. Contact
transparencies $t \sim 0.7$ are observed. The electronic phase coherence length
at low temperatures exceeds the channel length. However, the elastic scattering
length is a few times shorter than the channel length. Electrical measurements
reveal two regimes of quantum transport: (i) the Josephson regime,
characterized by a dissipationless current up to $\sim 100$ nA, and (ii) the
quantum dot regime, characterized by the formation of Andreev Bound States
(ABS) associated with spontaneous quantum dots inside the nanowire channel. In
regime (i), the behaviour of the critical current $I_c$ versus an axial
magnetic field $B_{||}$ shows an unexpected modulation and persistence to
fields $>2$ T. In the quantum dot regime, the ABS are modelled as the
current-biased solutions of an Anderson-type model. The applicability of
devices in both transport regimes to Majorana fermion experiments is discussed.

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The categories of this paper are: econ
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The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: funct-an
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
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The categories of this paper are: plasm-ph
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The categories of this paper are: solv-int
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-fin
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The categories of this paper are: math-ph
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The categories of this paper are: stat