Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Carbon nanotube quantum pumps   Recently nanomechanical devices composed of a long stationary inner carbon
nanotube and a shorter, slowly-rotating outer tube have been fabricated. In
this Letter, we study the possibility of using such devices as adiabatic
quantum pumps. Using the Brouwer formula, we employ a Green's function
technique to determine the pumped charge from one end of the inner tube to the
other, driven by the rotation of a chiral outer nanotube. We show that there is
virtually no pumping if the chiral angle of the two nanotubes is the same, but
for optimal chiralities the pumped charge can be a significant fraction of a
theoretical upper bound.

6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg