Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin fractionalization of an even number of electrons in a Quantum dot   An experiment is proposed of non perturbative tunneling in a Quantum dot
connected to leads in a pillar configuration, which would shed light on the
physics of the mesoscopic Kondo problem. We propose for the first time that
what is coupled to the leads in the case of even number of electrons on the dot
is not just the electrons on the QD, with their own spins, but the very total
spin of the dot macroscopic state itself, that displays features of the Kondo
physics, that leads to fractionalization of the spin in the dot, that is to a
"spinon box".

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The categories of this paper are: mtrl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
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The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: econ
9
The categories of this paper are: nlin
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The categories of this paper are: q-alg
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The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
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The categories of this paper are: atom-ph