Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamic Nuclear Overhauser Shifts in Larmor beats from a quantum well   The significance of nuclear spin polarisation in time-resolved optical
studies of III-V semiconductors is addressed. Electron Larmor beats in
pump-probe reflectivity from a GaAs/AlGaAs quantum well show Overhauser shift
of 0.7 T due to accumulated nuclear polarisation <I>/I=0.065. This leads to
precision values of electron g-factor, elucidates nuclear spin pumping and
diffusion mechanisms in quantum wells and informs discussion of implications
for spin-electronics and transport.

18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess