Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Fermi-polaron in two dimensions: Importance of the two-body bound
  state   We investigate a single impurity interacting with a free two-dimensional
atomic Fermi gas. The interaction between the impurity and the gas is
characterized by an arbitrary attractive short-range potential, which, in two
dimensions, always admits a two-particle bound state. We provide analytical
expressions for the energy and the effective mass of the dressed impurity by
including the two-body bound state, which is crucial for strong interactions,
in the integral equation for the effective interaction. Using the same method
we give also the results for the polaron parameters in one and three dimensions
finding a pretty good agreement with previous known results. Thus our relations
can be used as a simple way to estimate the polaron parameters once the
two-body bound state of the interaction potential is known.

27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex