Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Theory of the microwave-induced photocurrent and photovoltage
  magnetooscillations in a spatially non-uniform 2D electron gas   Recent experiment [S.I. Dorozhkin et al., Phys. Rev. Lett. 102, 036602
(2009)] on quantum Hall structures with strongly asymmetric contact
configuration discovered microwave-induced photocurrent and photovoltage
magnetooscillations in the absence of dc driving. We show that in an irradiated
sample the Landau quantization leads to violation of the Einstein relation
between the dc conductivity and diffusion coefficient. Then, in the presence of
a built-in electric field in a sample, the microwave illumination causes
photo-galvanic signals which oscillate as a function of magnetic field with the
period determined by the ratio of the microwave frequency to the cyclotron
frequency, as observed in the experiment.

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The categories of this paper are: chem-ph
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The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: acc-phys
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The categories of this paper are: atom-ph
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The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
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The categories of this paper are: funct-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: supr-con
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The categories of this paper are: q-alg
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The categories of this paper are: dg-ga
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The categories of this paper are: mtrl-th