Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Angular resolved electron energy loss spectroscopy in hexagonal boron
  nitride   Electron energy loss spectra have been measured on hexagonal boron nitride
single crystals employing a novel electron energy loss spectroscopic set-up
composed by an electron microscope equipped with a monochromator and an
in-column filter. This set-up provides high-quality energy-loss spectra and
allows also for the imaging of energy-filtered diffraction patterns. These two
acquisition modes provide complementary pieces of information, offering a
global view of excitations in reciprocal space. As an example of the
capabilities of the method we show how easily the core loss spectra at the $K$
edges of boron and nitrogen can be measured and imaged. Low losses associated
to interband and/or plasmon excitations are also measured. This energy range
allows us to illustrate that our method provides results of quality comparable
to those obtained from non resonant X-ray inelastic scattering, but with
advantageous specificities such as an enhanced sensitivity at low q and a much
higher simplicity and versatility that makes it well adapted to the study of
two-dimensional materials and related heterostructures. Finally, by comparing
theoretical calculations against our measures, we are able to relate the range
of applicability of ab initio calculations to the anisotropy of the sample and
assess the level of approximation required for a proper simulation of our
acquisition method.

2
The categories of this paper are: math
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th