Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Strain-induced Fermi contour anisotropy of GaAs 2D holes   We report measurements of magneto-resistance commensurability peaks, induced
by a square array of anti-dots, in GaAs (311)A two-dimensional holes as a
function of applied in-plane strain. The data directly probe the shapes of the
Fermi contours of the two spin subbands that are split thanks to the spin-orbit
interaction and strain. The experimental results are in quantitative agreement
with the predictions of accurate energy band calculations, and reveal that the
majority spin-subband has a severely distorted Fermi contour whose anisotropy
can be tuned with strain.

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The categories of this paper are: comp-gas
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The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
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The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
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The categories of this paper are: ao-sci
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The categories of this paper are: dg-ga
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The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
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The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: solv-int
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The categories of this paper are: eess