Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tunneling Density of States of the Interacting Two-Dimensional Electron
  Gas   We investigate the influence of electron--electron interactions on the
density of states of a ballistic two--dimensional electron gas. The density of
states is determined nonperturbatively by means of path integral techniques
allowing for reliable results near the Fermi surface, where perturbation theory
breaks down. We find that the density of states is suppressed at the Fermi
level to a finite value. This suppression factor grows with decreasing electron
density and is weakened by the presence of gates.

6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
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The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-th
2
The categories of this paper are: math