Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: From latent ferroelectricity to hyperferroelectricity in alkali lead
  halide perovskites   Using first principles calculations we show that several alkali lead halides
potentially present collective ferroelectric polarization. This should occur at
least at the nanoscale; it could be detected macroscopically provided it is not
concealed by lattice vibrations in the temperature range of stability of the
cubic perovskite phase. For potassium lead halides and for alkali lead
fluorides, remarkably, the ferroelectric behavior turns hyper-ferroelectric,
suggesting a more robust ferroelectric polarization in spite of depolarization
potentials induced by charge accumulation on surfaces or interfaces.

11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
2
The categories of this paper are: math
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex