Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Absence of Wigner molecules in one-dimensional few-fermion systems with
  short-range interactions   We study by means of exact-diagonalization techniques the ground state of a
few-fermion system with strong short-range repulsive interactions trapped by a
harmonic potential in one spatial dimension. Even when the ground-state density
profile displays at strong coupling very well pronounced Friedel oscillations
with a `4k_F periodicity', the pair correlation function does not show any
signature of Wigner-molecule-type correlations. For the sake of comparison, we
present also numerical results for few-electron systems with Coulomb
interactions, demonstrating that their ground state at strong coupling is, on
the contrary, a Wigner molecule.

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The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
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The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: econ
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
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The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc