Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Suppression of Spin Dephasing in a Two-Dimensional Electron Gas with a
  Quantum Point Contact   Spin-orbit coupling is a source of strong spin dephasing in two- and
three-dimensional semiconducting systems. We report that spin dephasing in a
two-dimensional electron gas can be suppressed by introducing a quantum point
contact. Surprisingly, this suppression was not limited to the vicinity of the
contact but extended to the entire two-dimensional electron gas. This
facilitates the electrical control of the spin degree of freedom in a
two-dimensional electron gas through spin-orbit coupling.

12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex