Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the ferromagnetic character of (LaVO$_3$)$_m$/SrVO$_3$ superlattices   The experimental observation that vanadate superlattices
(LaVO$_3$)$_m$/SrVO$_3$ show ferromagnetism up to room temperature [U.\
L\"uders {\it et al.}, Phys.\ Rev.\ B {\bf 80}, 241102R (2009)] is investigated
by means of density functional theory. First, the influence of the density
functional on the electronic and magnetic structure of bulk ${\rm LaVO_3}$ is
discussed. Second, the band structure of a (LaVO$_3$)$_m$/SrVO$_3$ slab for
$m=5$ and 6 is calculated. Very different behaviors for odd and even values of
$m$ are found: In the odd case lattice relaxation results into a buckling of
the interface VO$_2$ layers that leads to spin-polarized interfaces. In the
even case a decoupling of the interface VO$_2$ layers from the LaO layers is
obtained, confining the interface electrons into a two-dimensional electron
gas. The orbital reconstruction at the interface due to the lattice relaxation
is discussed.

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The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph