Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exciton spin relaxation in InAs/InGaAlAs/InP(001) quantum dashes
  emitting near 1.55 {\mu}m   Exciton spin and related optical polarization in self-assembled
InAs/In$_{0.53}$Ga$_{0.23}$Al$_{0.24}$As/InP(001) quantum dashes emitting at
1.55 {\mu}m are investigated by means of polarization- and time-resolved
photoluminescence, as well as photoluminescence excitation spectroscopy, at
cryogenic temperature. We investigate the influence of highly non-resonant and
quasi-resonant optical spin pumping conditions on spin polarization and spin
memory of the quantum dash ground state. We show that a spin pumping scheme,
utilizing the longitudinal-optical-phonon-mediated coherent scattering process,
can lead to the polarization degree above 50%. We discuss the role of intrinsic
asymmetries in the quantum dash that influence values of the degree of
polarization and its time evolution.

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The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
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The categories of this paper are: alg-geom
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The categories of this paper are: eess
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The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
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The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
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The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
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The categories of this paper are: q-alg
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The categories of this paper are: econ
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The categories of this paper are: supr-con
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The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
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The categories of this paper are: bayes-an