Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bipolar single-wall carbon nanotube field-effect transistor   We use a simultaneous flow of ethylene and hydrogen gases to grow single wall
carbon nanotubes by chemical vapor deposition. Strong coupling to the gate is
inferred from transport measurements for both metallic and semiconducting
tubes. At low-temperatures, our samples act as single-electron transistors
where the transport mechanism is mainly governed by Coulomb blockade. The
measurements reveal very rich quantized energy level spectra spanning from
valence to conduction band. The Coulomb diamonds have similar addition energies
on both sides of the semiconducting gap. Signatures of subbands population has
been observed.

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The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org