Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A spin-polarizing electron beam splitter from crossed graphene
  nanoribbons   Junctions composed of two crossed graphene nanoribbons (GNRs) have been
theoretically proposed as electron beam splitters where incoming electron waves
in one GNR can be split coherently into propagating waves in \emph{two}
outgoing terminals with nearly equal amplitude and zero back-scattering. Here
we scrutinize this effect for devices composed of narrow zigzag GNRs taking
explicitly into account the role of Coulomb repulsion that leads to
spin-polarized edge states within mean-field theory. We show that the
beam-splitting effect survives the opening of the well-known correlation gap
and, more strikingly, that a \emph{spin-dependent} scattering potential emerges
which spin-polarizes the transmitted electrons in the two outputs. A
near-perfect polarization can be achieved by joining several junctions in
series. Our findings suggest that GNRs are interesting building blocks in
spintronics and quantum technologies with applications for interferometry and
entanglement.

19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio