Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optically-detected long-lived spin coherence in multilayer systems:
  Double and triple quantum wells   In this contribution, we investigated the spin coherence of high-mobility
dense two-dimensional electron gases confined in multilayer systems. The
dynamics of optically-induced spin polarization was experimentally studied
employing the time-resolved Kerr rotation and resonant spin amplification
techniques. For both the double and triple quantum wells doped beyond the
metal-insulator transition, where the spin coherence is greatly suppressed, we
found remarkably long spin lifetimes limited by the Dyakonov-Perel mechanism
and spin hopping process between the donor sites as well as the spread of
ensemble g-factor. The double quantum well structure yields a spin lifetime of
6.25 ns at T = 5 K while the triple quantum well shows a spin lifetime
exceeding 25 ns at T = 8 K.

24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
18
The categories of this paper are: econ