Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin-Galvanic Effect in Quantum Wells   It is shown that a homogeneous non-equlibrium spin-polarization in
semiconductor heterostructures results in an electric current. The microscopic
origin of the effect is an inherent asymmetry of spin-flip scattering in
systems with lifted spin degeneracy caused by k-linear terms in the
Hamiltonian.

29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex