Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin-Dependent Quantized Magnetic Flux Through The Electronic Orbits of
  Dirac Hydrogen Atom   We investigate the quantized magnetic flux through the electronic orbits of
Dirac hydrogen atom in the absence of an external magnetic field. The sources
of the magnetic fields are taken to be that of proton's magnetic moment $\mu
_{p}$ and electron's magnetic moment $\mu_{e}$ (or $\mu_{j}$) which has two
components namely the orbital part $\mu_{l}$ and the spinning part $\mu_{s}$
>.We show that the quantized magnetic fluxes through the electronic orbits
corresponding to the ($n,l=n-1,m_{j}$) eigenstates of Dirac hydrogen atom take
the forms: $\Phi (n,l,m_{j})=[ n-l-m_{j}] \Phi_{0}$, where $\Phi
_{0}=\frac{h}{| e|}$ is the flux quanta. The application of the present result
to the selection rules for the optical transitions of hydrogen atom gives
access to the spin flip-floppings. The present result is believed to serve a
significant help for understanding the recent observations of spin relaxation
in excitonic transitions (such as 1s -> 2p or 2p -> 3d) in nanostructures.

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The categories of this paper are: gr-qc
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The categories of this paper are: hep-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: supr-con
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The categories of this paper are: solv-int
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The categories of this paper are: cs
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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: nucl-ex
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The categories of this paper are: astro-ph
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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: comp-gas
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The categories of this paper are: patt-sol
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The categories of this paper are: q-alg
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The categories of this paper are: alg-geom