Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electronic conductivity and structural distortion at the interface
  between insulators SrTiO3 and LaAlO3   When insulator LaAlO3 is grown by epitaxy onto a TiO2-terminated {100}
surface of insulator SrTiO3, the resulting system has a metallic character.
This phenomenon has been associated with an electrostatic frustration at the
interface, as {100} surfaces of SrTiO3 are neutral while those of LaAlO3 are
polar, but its microscopic mechanism is not quite understood. Here, we present
a structural characterisation of this interface by aberration-corrected
transmission electron microscopy. The unit cells at the interface appear
elongated: we discuss this distortion in terms of electrostatic charge and
extra carriers at the interface.

31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat