Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Decoherence of Excitons in Multichromophore Systems: Thermal Line
  Broadening and Destruction of Superradiant Emission   We study the temperature-dependent dephasing rate of excitons in chains of
chromophores, accounting for scattering on static disorder as well as acoustic
phonons in the host matrix. From this we find a powerlaw temperature dependence
of the absorption line width, in excellent quantitative agreement with
experiments on dye aggregates. We also propose a relation between the line
width and the exciton coherence length imposed by the phonons. The results
indicate that the much debated steep rise of the fluorescence lifetime of
pseudo-isocyanine aggregates above 40 K results from the fact that this
coherence length drops below the localization length imposed by static
disorder.

8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys