Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nuclear magnetic resonance spectroscopy of nonequilibrium steady states
  in quantum dots   The optically induced polarization of localized electron spins in an ensemble
of quantum dots (QDs) dephases due to the interaction with the surrounding
nuclear spins. Despite this dephasing, the spins in the QDs can be controlled
to respond coherently by applying periodic laser pulses, leading to a revival
of the spin polarization before each pulse. This effect, known as spin mode
locking, strongly depends on an emerging selection of certain polarizations of
the nuclear spin bath which is driven to a steady state far from equilibrium.
We investigate the influence of the nuclear composition in In$_x$Ga$_{1-x}$As
QDs on this nonequilibrium behavior and demonstrate that nuclear magnetic
resonances (NMR) appear as very sharp minima in the magnetic field dependence
of the revival amplitude. This suggests a novel kind of NMR spectroscopy.

24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con