Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Interface-sensitive nuclear magnetic resonance at a semiconductor
  heterojunction using hyperpolarization   We demonstrate an interface-sensitive NMR in a semiconducting nanostructure,
where an NMR signal from the minute heterojunction region of a model
heterojunction structure (In$_{0.48}$Ga$_{0.52}$P/GaAs) is detected by using
nuclear hyperpolarization created by optical pumping. The key to the detection
is the use of minute lattice distortions occurring at the heterojunction due to
the lattice mismatch, which enables us to create and localize hyperpolarization
at the heterojunction and distinguish it from the other parts. In particular,
the suppression of nuclear spin diffusion by the spatial variation in the
strain and the resultant unexpectedly stable hyperpolarization at the
heterojunction are the keys to successful detection.

14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph