Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Proximity Effect Transfer from NbTi into a Semiconductor Heterostructure
  via Epitaxial Aluminum   We demonstrate the transfer of the superconducting properties of NbTi---a
large-gap high-critical-field superconductor---into an InAs heterostructure via
a thin intermediate layer of epitaxial Al. Two device geometries, a Josephson
junction and a gate-defined quantum point contact, are used to characterize
interface transparency and the two-step proximity effect. In the Josephson
junction, multiple Andreev reflection reveal near-unity transparency, with an
induced gap $\Delta^*=0.50~\mathrm{meV}$ and a critical temperature of
$7.8~\mathrm{K}$. Tunneling spectroscopy yields a hard induced gap in the InAs
adjacent to the superconductor of $\Delta^*=0.43~\mathrm{meV}$ with
substructure characteristic of both Al and NbTi.

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The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
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The categories of this paper are: q-alg
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The categories of this paper are: supr-con
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The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
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The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol