Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fractional Charge Experiments: What quantity is measured in quantum Hall
  effect or calculated by Laughlin?   We have examined the experiments performed by Goldman and Su, de-Picciotto et
al, Samanadayar et al and Conforti et al in which it is claimed that a
fractional charge of e/3 is found. In all of the measurements, the quantity
measured is the product of the charge and the magnetic field but not the
charge. It is possible to interpret that charge per unit area has been
measured, where the area is the square of the magnetic length. This type of
correction to Laughlin's result does not affect the exactness of the
calculation. Anderson has suggested the extension of Laughlin's state to
particles of charge 2/m or 3/m with m=odd integer. We find that the
quasiparticle charge depends on the angular momenta, e_{eff}/e=({\it
l}+(1/2)\pm s)/(2{\it l}+1) which agrees with the data. Therefore, Laughlin's
1/odd becomes an angular momentum so the charge depends on spin, s.

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The categories of this paper are: physics
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The categories of this paper are: hep-ph
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The categories of this paper are: funct-an
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The categories of this paper are: econ
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The categories of this paper are: hep-lat
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The categories of this paper are: comp-gas
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The categories of this paper are: chao-dyn
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The categories of this paper are: ao-sci
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The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
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The categories of this paper are: dg-ga
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: eess
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The categories of this paper are: hep-ex