Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Density Induced Interchange of Anisotropy Axes at Half-Filled High
  Landau Levels   We observe density induced 90$^{\circ}$ rotations of the anisotropy axes in
transport measurements at half-filled high Landau levels in the two dimensional
electron system, where stripe states are proposed ($\nu$=9/2, 11/2, etc). Using
a field effect transistor, we find the transition density to be
$2.9\times10^{11}$cm$^{-2}$ at $\nu$=9/2. Hysteresis is observed in the
vicinity of the transition. We construct a phase boundary in the filling
factor-magnetic field plane in the regime $4.4<\nu<4.6$. An in-plane magnetic
field applied along either anisotropy axis always stabilizes the low density
orientation of the stripes.

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The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
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The categories of this paper are: q-alg
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
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The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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The categories of this paper are: eess
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The categories of this paper are: ao-sci
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The categories of this paper are: funct-an
3
The categories of this paper are: physics
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The categories of this paper are: cmp-lg