Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evidence for Skyrmion crystallization from NMR relaxation experiments   A resistively detected NMR technique was used to probe the two-dimensional
electron gas in a GaAs/AlGaAs quantum well. The spin-lattice relaxation rate
$(1/T_{1})$ was extracted at near complete filling of the first Landau level by
electrons. The nuclear spin of $^{75}$As is found to relax much more
efficiently with $T\to 0$ and when a well developed quantum Hall state with
$R_{xx}\simeq 0$ occurs. The data show a remarkable correlation between the
nuclear spin relaxation and localization. This suggests that the magnetic
ground state near complete filling of the first Landau level may contain a
lattice of topological spin texture, i.e. a Skyrmion crystal.

22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex