Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magneto-transport in high g-factor, low-density two-dimensional electron
  systems confined in In_0.75Ga_0.25As/In_0.75Al_0.25As quantum wells   We report magneto-transport measurements on high-mobility two-dimensional
electron systems (2DESs) confined in In_0.75Ga_0.25As/In_0.75Al_0.25As single
quantum wells. Several quantum Hall states are observed in a wide range of
temperatures and electron densities, the latter controlled by a gate voltage
down to values of 1.10^11 cm^-2. A tilted-field configuration is used to induce
Landau level crossings and magnetic transitions between quantum Hall states
with different spin polarizations. A large filling factor dependent effective
electronic g-factor is determined by the coincidence method and cyclotron
resonance measurements. From these measurements the change in
exchange-correlation energy at the magnetic transition is deduced. These
results demonstrate the impact of many-body effects in tilted-field
magneto-transport of high-mobility 2DESs confined in
In_0.75Ga_0.25As/In_0.75Al_0.25As quantum wells. The large tunability of
electron density and effective g-factor, in addition, make this material system
a promising candidate for the observation of a large variety of spin-related
phenomena.

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The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
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The categories of this paper are: eess
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
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The categories of this paper are: cs
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-ex