Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Current flow past an etched barrier: field emission from a
  two-dimensional electron gas   We find that, under appropriate conditions, electrons can pass a barrier
etched across a two dimensional electron gas (2DEG) by field emission from the
GaAs/AlGaAs heterojunction into a second, low-density 2DEG formed deep in the
substrate. The current-voltage characteristics exhibit a rapid increase in the
current at the field emission threshold and intrinsic bistability above this
threshold, consistent with a heating instability occurring in the second 2DEG.
These results may explain similar behaviour recently seen in a number of
front-gated devices by several groups.

18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th