Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Oscillation of spin polarization in a two-dimensional hole gas under a
  perpendicular magnetic field   Spin-charge coupling is studied for a strongly confined two-dimensional hole
gas subject to a perpendicular magnetic field. The study is based on
spin-charge coupled drift-diffusion equations derived from quantum-kinetic
equations in an exact manner. The spin-orbit interaction induces an extra
out-of-plane spin polarization. This contribution exhibits a persistent
oscillatory pattern in the strong-coupling regime.

29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int