Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tuning Negative Differential Resistance in a Molecular Film   We have observed tunable negative differential resistance (NDR) in scanning
tunneling spectroscopy measurements of a double layer of C60 molecules on a
metallic surface. Using a simple model we show that the observed NDR behavior
is explained by voltage-dependent changes in the tunneling barrier height.

7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin