Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electron transfer and ionic displacements at the origin of the 2D
  electron gas at the LAO/STO interface: Direct measurements with atomic-column
  spatial resolution   The discovery that the interface between two band gap insulators LaAlO3 and
SrTiO3 is highly conducting has raised an enormous interest in the field of
oxide electronics. The LAlO3/SrTiO3 interface can be tuned using an electric
field and switched from a superconducting to an insulating state. Conducting
paths in an insulating background can be written applying a voltage with the
tip of an atomic force microscope, creating great promise for the development
of a new generation of nanoscale electronic devices. However, the mechanism for
interface conductivity in LaAlO3/SrTiO3 has remained elusive. The theoretical
explanation based on an intrinsic charge transfer (electronic reconstruction)
has been strongly challenged by alternative descriptions based on point
defects. In this work, thanks to modern aberration-corrected electron probes
with atomic-scale spatial resolution, interfacial charge and atomic
displacements originating the electric field within the system can be
simultaneously measured, yielding unprecedented experimental evidence in favor
of an intrinsic electronic reconstruction.

10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg