Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electromotive Force Generated by Spin Accumulation in FM/$n$-GaAs
  Heterostructures   We report on a method of quantifying spin accumulation in
Co$_{2}$MnSi/$n$-GaAs and Fe/$n$-GaAs heterostructures using a non-magnetic
probe. In the presence of a large non-equilibrium spin polarization, the
combination of a non-constant density of states and energy-dependent
conductivity generates an electromotive force (EMF). We demonstrate that this
signal dephases in the presence of applied and hyperfine fields, scales
quadratically with the polarization, and is comparable in magnitude to the
spin-splitting. Since this spin-generated EMF depends only on experimentally
accessible parameters of the bulk material, its magnitude may be used to
quantify the injected spin polarization in absolute terms.

31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics