Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photovoltage Effects in Photoemission from Thin GaAs Layers   A set of thin GaAs p-type negative electron affinity (NEA) photocathodes have
been used to measure the yield of photoemitted electrons at high intensity
excitation. The active layer thickness is 100 nm and the p-type doping ranges
from 5\times10^{18} cm^{-3} to 5\times10^{19} cm^{-3} for a set of four
samples. The results show that the surface escape probability is a linear
function of the NEA energy. The surface photovoltage effect on photoemission is
found to diminish to zero at a doping level of 5\times10^{19} cm^{-3}. The
experimental results are shown to be in good agreement with calculations using
a charge limit model based on surface photovoltage kinetics that assume a
constant electron energy relaxation rate in the band bending region.

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The categories of this paper are: nucl-th
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The categories of this paper are: q-bio
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The categories of this paper are: bayes-an
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The categories of this paper are: alg-geom
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The categories of this paper are: chao-dyn
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: gr-qc
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The categories of this paper are: q-fin
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The categories of this paper are: mtrl-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: stat
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The categories of this paper are: supr-con