Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exciton energy transfer in nanotube bundles   Photoluminescence is commonly used to identify the electronic structure of
individual nanotubes. But, nanotubes naturally occur in bundles. Thus, we
investigate photoluminescence of nanotube bundles. We show that their complex
spectra are simply explained by exciton energy transfer between adjacent tubes,
whereby excitation of large gap tubes induces emission from smaller gap ones
via Forster interaction between excitons. The consequent relaxation rate is
faster than non-radiative recombination, leading to enhanced photoluminescence
of acceptor tubes. This fingerprints bundles with different compositions and
opens opportunities to optimize them for opto-electronics.

9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
1
The categories of this paper are: cs
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th