Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Rashba semiconductor as spin Hall material: Experimental demonstration
  of spin pumping in wurtzite $n$-GaN:Si   Pure spin currents in semiconductors are essential for implementation in the
next generation of spintronic elements. Heterostructures of III- nitride
semiconductors are currently employed as central building-blocks for lighting
and high-power devices. Moreover, the long relaxation times and the spin-orbit
coupling (SOC) in these materials indicate them as privileged hosts for spin
currents and related phenomena. Spin pumping is an efficient mechanism for the
inception of spin current and its conversion into charge current in
non-magnetic metals and semiconductors with Rashba SOC $via$ spin Hall effects.
We report on the generation in $n$-GaN:Si\,--\,at room temperature and through
spin pumping\,--\,of pure spin current, fundamental for the understanding of
the spin dynamics in these non-centrosymmetric Rashba systems. We find for
$n$-GaN:Si a spin Hall angle $\theta_{\mathrm{SH}}$=$3.03\times10^{-3}$,
exceeding by one order of magnitude those reported for other semiconductors,
pointing at III-nitrides as particularly efficient spin current generators.

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The categories of this paper are: cmp-lg
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The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-th
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The categories of this paper are: mtrl-th
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The categories of this paper are: adap-org
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The categories of this paper are: eess
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin
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The categories of this paper are: patt-sol
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The categories of this paper are: q-bio
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The categories of this paper are: stat
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The categories of this paper are: plasm-ph
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The categories of this paper are: physics
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-lat