Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Carbon Nanotube Electron Windmills: A Novel Design for Nanomotors   We propose a new drive mechanism for carbon nanotube (CNT) motors, based upon
the torque generated by a flux of electrons passing through a chiral nanotube.
The structure of interest comprises a double-walled CNT, formed from, for
example, an achiral outer tube encompassing a chiral inner tube. Through a
detailed analysis of electrons passing through such a "windmill", we find that
the current due to a potential difference applied to the outer CNT generates
sufficient torque to overcome the static and dynamic frictional forces that
exists between the inner and outer walls, thereby causing the inner tube to
rotate.

27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
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The categories of this paper are: solv-int
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
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The categories of this paper are: ao-sci
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The categories of this paper are: eess
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc