Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Orbital dynamics: The origin of the anomalous optical spectra in
  ferromagnetic manganites   We discuss the role of orbital degeneracy in the transport properties of
perovskite manganites, focusing in particular on the optical conductivity in
the metallic ferromagnetic phase at low temperatures. Orbital degeneracy and
strong correlations are described by an orbital t-J model which we treat in a
slave-boson approach. Employing the memory-function formalism we calculate the
optical conductivity, which is found to exhibit a broad incoherent component
extending up to bare bandwidth accompanied by a strong suppression of the Drude
weight. Further, we calculate the constant of T-linear specific heat. Our
results are in overall agreement with experiment and suggest low-energy orbital
fluctuations as the origin of the strongly correlated nature of the metallic
phase of manganites.

12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
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The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas