Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: In-plane magnetic field dependence of cyclotron relaxation time in a Si
  two-dimensional electron system   Cyclotron resonance of two-dimensional electrons is studied for a
high-mobility Si/SiGe quantum well in the presence of an in-plane magnetic
field, which induces spin polarization. The relaxation time $\tau_{CR}$ shows a
negative in-plane magnetic field dependence, which is similar to that of the
transport scattering time $\tau_t$ obtained from dc resistivity. The resonance
magnetic field shows an unexpected negative shift with increasing in-plane
magnetic field.

16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph