Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Majorana fermions of a two-dimensional Px+iPy superconductor   To investigate Majorana fermionic excitations of a $p_x+ip_y$ superconductor,
the Bogoliubov-de-Gennes equation is solved on a sphere for two cases: (i) a
vortex-antivortex pair at opposite poles and (ii) an edge near the south pole
and an antivortex at the north pole. The vortex cores support a state of two
Majorana fermions, the energy of which decreases exponentially with the radius
of the sphere, independently of a moderate disorder potential. The tunneling
conductance of an electron into the superconductor near the position of a
vortex is computed for finite temperature, and is compared to the case of an
{\it s}-wave superconductor. The zero bias conductance peak of the antivortex
is half that of the vortex. This effect can be used as a probe of the order
parameter symmetry, and as a direct measurement of the Majorana fermion.

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The categories of this paper are: bayes-an
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The categories of this paper are: mtrl-th
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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: q-fin
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The categories of this paper are: atom-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-alg
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-ex
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The categories of this paper are: supr-con
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The categories of this paper are: quant-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: math
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The categories of this paper are: nlin