Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Torsion-induced persistent current in a twisted quantum ring   We describe the effects of geometric torsion on the coherent motion of
electrons along a thin twisted quantum ring. The geometric torsion inherent in
the quantum ring triggers a quantum phase shift in the electrons' eigenstates,
thereby resulting in a torsion-induced persistent current that flows along the
twisted quantum ring. The physical conditions required for detecting the
current flow are discussed.

18
The categories of this paper are: econ
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
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The categories of this paper are: stat
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The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
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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: astro-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex