Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Polarons in the radio-frequency spectrum of a quasi-two-dimensional
  Fermi gas   We measure radio-frequency spectra for a two-component mixture of a $^6$Li
atomic Fermi gas in the quasi-two-dimensional regime. Near the Feshbach
resonance, where the transverse Fermi energy is large compared to the
confinement-induced dimer binding energies for the initial and final states, we
find that the observed resonances do not correspond to transitions between
confinement-induced dimers. The spectrum appears to be well-described by
transitions between noninteracting polaron states in two dimensions.

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The categories of this paper are: bayes-an
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The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
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The categories of this paper are: eess
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph