Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tunneling Anisotropic Spin Polarization in lateral (Ga,Mn)As/GaAs spin
  Esaki diode devices   We report here on anisotropy of spin polarization obtained in lateral
all-semiconductor all-electrical spin injection devices, employing
$p^{+}-$(Ga,Mn)As/$n^{+}-$GaAs Esaki diode structures as spin aligning
contacts, resulting from the dependence of the efficiency of spin tunneling on
the orientation of spins with respect to different crystallographic directions.
We observed an in-plane anisotropy of $~8%$ in case of spins oriented either
along $[1\bar{1}0]$ or $[110]$ directions and $~25%$ anisotropy between
in-plane and perpendicular-to-plane orientation of spins.

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The categories of this paper are: astro-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: ao-sci
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The categories of this paper are: nlin
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The categories of this paper are: math
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The categories of this paper are: dg-ga
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The categories of this paper are: chem-ph
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The categories of this paper are: eess
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The categories of this paper are: chao-dyn
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The categories of this paper are: atom-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org
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The categories of this paper are: cs
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The categories of this paper are: q-fin
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The categories of this paper are: math-ph