Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phase Fluctuations and Single Fermion Spectral Density in 2D Systems
  with Attraction   The effect of static fluctuations in the phase of the order parameter on the
normal and superconducting properties of a 2D system with attractive
four-fermion interaction is studied. Analytic expressions for the fermion
Green's function, its spectral density, and the density of states are derived
in the approximation where the coupling between the spin and charge degrees of
freedom is neglected. The resulting single-particle Green's function clearly
demonstrates a non-Fermi liquid behavior. The results show that as the
temperature increases through the 2D critical temperature, the width of the
quasiparticle peaks broadens significantly.

37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
3
The categories of this paper are: physics