Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phase diagram and optical conductivity of the ionic Hubbard model   We investigate the ground state phase diagram of the one-dimensional ionic
Hubbard model with an alternating potential at half-filling by the bosonization
technique as well as by numerical diagonalization of finite systems with the
Lanczos and DMRG methods. Our results support the existence of a single
"metallic" transition point from a band to a correlated insulator with
simultaneous charge and bond-charge order. In addition, we present results for
the optical conductivity obtained by the dynamical DMRG method. The
insulator-insulator phase transition scenario is discussed in detail including
a critical review of existing approaches and results for the ionic Hubbard
model.

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The categories of this paper are: acc-phys
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The categories of this paper are: hep-lat
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The categories of this paper are: alg-geom
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The categories of this paper are: gr-qc
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The categories of this paper are: bayes-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-th
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The categories of this paper are: astro-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: dg-ga
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The categories of this paper are: atom-ph
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The categories of this paper are: math
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The categories of this paper are: funct-an