Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lattice Distortions and Charge Carriers in Cuprates   A phenomenological model with itinerant bands and local states trapped by the
lattice on the Cu-sites, is discussed to describe global features of cuprates.
Relative energy positions of localized and itinerant states being tuned
(thermodynamically or by doping), the system must undergo 1st order Mott
metal-insulator transition. Decreasing the local level (from the metallic end
of a stoichiometric compound), charge separation instability occurs first
before the Mott transition. Crossing and hybridization between local (flat) and
itinerant bands introduce a structure in density of states which may account
for ``pseudogap'' features in cuprates. Model results in polaronic lattice
effects and is rich enough to serve as a phenomenology of cuprates.

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The categories of this paper are: cs
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The categories of this paper are: dg-ga
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The categories of this paper are: math
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The categories of this paper are: hep-ex
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The categories of this paper are: adap-org
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The categories of this paper are: chao-dyn
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The categories of this paper are: nlin
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The categories of this paper are: patt-sol
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The categories of this paper are: q-alg
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The categories of this paper are: astro-ph
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The categories of this paper are: solv-int
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The categories of this paper are: q-fin
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: physics
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The categories of this paper are: quant-ph