Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fractional Quantum Hall Effect, Cranked Harmonic Oscillator, and
  Classical Periodic Orbits   A two-dimensional harmonic oscillator, when rotated by the oscillator
frequency, generates Landau-like levels. A further cranking results in
condensates and gaps resembling the fractional quantum Hall effect. For a
filling fraction $\nu=p/q$, with $q$ odd, the model predicts that the gap is
proportional to $\sqrt{n_{e}/pq}$, where $n_{e}$ is the electron density of the
sample. This agrees well with recent experimental data. Qualitative arguments
for the success of the model are given.

34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org