Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Theoretical Perspectives on Spintronics and Spin-Polarized Transport   Selected problems of fundamental importance for spintronics and
spin-polarized transport are reviewed, some of them with a special emphasis on
their applications in quantum computing and coherent control of quantum
dynamics. The role of the solid-state environment in the decoherence of
electron spins is discussed. In particular, the limiting effect of the
spin-orbit interaction on spin relaxation of conduction electrons is carefully
examined in the light of recent theoretical and experimental progress. Most of
the proposed spintronic devices involve spin-polarized transport across
interfaces in various hybrid structures. The specific example discussed here,
of a magnetic semiconductor/superconductor interface, displays many intricacies
which a complex spin-dependent interface introduces in the spin-polarized
transport. It is proposed that pairs of entangled electrons in a superconductor
(Cooper pairs) can be transfered to a non-superconducting region, and
consequently separated for a transport study of the spin entanglement. Several
important theoretical proposals for quantum computing are based on electronic
and nuclear spin entanglement in a solid. Physical requirements for these
proposals to be useful are discussed and some alternative views are presented.
Finally, a recent discovery of optical control of nuclear spins in
semiconductors is reviewed and placed in the context of a long-standing search
for electronic control of nuclear dynamics.

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The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
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The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess