Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Design of a multifunctional polar metal via first-principles
  high-throughput structure screening   Intrinsic polar metals are rare, especially in oxides, because free electrons
screen electric fields in a metal and eliminate the internal dipoles that are
needed to break inversion symmetry. Here we use first-principles
high-throughput structure screening to predict a new polar metal in bulk and
thin film forms. After screening more than 1000 different crystal structures,
we find that ordered BiPbTi2O6 can crystallize in three polar and metallic
structures, which can be transformed between via pressure or strain. In a
heterostructure of layered BiPbTi2O6 and PbTiO3, multiple states with different
relative orientations of BiPbTi2O6 polar displacements, and PbTiO3
polarization, can be stabilized. At room temperature, the interfacial coupling
enables electric fields to first switch PbTiO3 polarization and subsequently
drive 180{\deg} change of BiPbTi2O6 polar displacements. At low temperatures,
the heterostructure provides a tunable tunnelling barrier and might be used in
multi-state memory devices.

33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
2
The categories of this paper are: math
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph