Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Momentum-resolved electronic band structure and offsets in an epitaxial
  NbN/GaN superconductor/semiconductor heterojunction   The electronic structure of heterointerfaces play a pivotal role in their
device functionality. Recently, highly crystalline ultrathin films of
superconducting NbN have been integrated by molecular beam epitaxy with the
semiconducting GaN. We use soft X-ray angle-resolved photoelectron spectroscopy
to directly measure the momentum-resolved electronic band structures for both
NbN and GaN constituents of this Schottky heterointerface, and determine their
momentum-dependent interfacial band offset as well as the band-bending profile
into GaN. We find, in particular, that the Fermi states in NbN are aligned
against the band gap in GaN, which excludes any significant electronic
cross-talk of the superconducting states in NbN through the interface to GaN.
We support the experimental findings with first-principles calculations for
bulk NbN and GaN. The Schottky barrier height obtained from photoemission is
corroborated by electronic transport and optical measurements. The
momentum-resolved understanding of electronic properties elucidated by the
combined materials advances and experimental methods in our work opens up new
possibilities in systems where interfacial states play a defining role.

17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph