Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bound states in a quasi-two-dimensional Fermi gas   We consider the problem of N identical fermions of mass M and one
distinguishable particle of mass m interacting via short-range interactions in
a confined quasi-two-dimensional (quasi-2D) geometry. For N=2 and mass ratios
M/m<13.6, we find non-Efimov trimers that smoothly evolve from 2D to 3D. In the
limit of strong 2D confinement, we show that the energy of the N+1 system can
be approximated by an effective two-channel model. We use this approximation to
solve the 3+1 problem and we find that a bound tetramer can exist for mass
ratios M/m as low as 5 for strong confinement, thus providing the first example
of a universal, non-Efimov tetramer involving three identical fermions.

24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th