Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ballistic spin filtering across the ferromagnetic-semiconductor
  interface   The ballistic spin-filter effect from a ferromagnetic metal into a
semiconductor has theoretically been studied with an intention of detecting the
spin polarizability of density of states in FM layer at a higher energy level.
The physical model for the ballistic spin filtering across the interface
between ferromagnetic metals and semiconductor superlattice is developed by
exciting the spin polarized electrons into n-type AlAs/GaAs superlattice layer
at a much higher energy level and then ballistically tunneling through the
barrier into the ferromagnetic film. Since both the helicity-modulated and
static photocurrent responses are experimentally measurable quantities, the
physical quantity of interest, the relative asymmetry of spin-polarized
tunneling conductance, could be extracted experimentally in a more
straightforward way, as compared with previous models. The present physical
model serves guidance for studying spin detection with advanced performance in
the future.

15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin