Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Microwave Hall Effect   This paper describes a simple microwave apparatus to measure the Hall effect
in semiconductor wafers. The advantage of this technique is that it does not
require contacts on the sample or the use of a resonant cavity. Our method
consists of placing the semiconductor wafer into a slot cut in an X-band (8 -
12 GHz) waveguide series tee, injecting microwave power into the two opposite
arms of the tee, and measuring the microwave output at the third arm. A
magnetic field applied perpendicular to the wafer gives a microwave Hall signal
that is linear in the magnetic field and which reverses phase when the magnetic
field is reversed. The microwave Hall signal is proportional to the
semiconductor mobility, which we compare for calibration purposes with d. c.
mobility measurements obtained using the van der Pauw method. We obtain the
resistivity by measuring the microwave reflection coefficient of the sample.
This paper presents data for silicon and germanium samples doped with boron or
phosphorus. The measured mobilities ranged from 270 to 3000 cm2 /(V-sec).

12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
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The categories of this paper are: nlin
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
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The categories of this paper are: astro-ph
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The categories of this paper are: acc-phys
0
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: math-ph
33
The categories of this paper are: plasm-ph
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The categories of this paper are: cmp-lg