Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Decay properties of the density matrix and Wannier functions for
  interacting systems   For non-interacting electrons the one-particle density matrix and the related
Wannier functions characterize a material as insulating or metallic.
Introducing many-body Wannier functions, we show that this characterization can
be carried over to interacting systems. In particular, we find that an
exponential decay of the density matrix characterizes not only band insulators
but also Mott insulators. The properties of the many-body Wannier functions
differ, however, from those of the Wannier functions of a non-interacting
systems.

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The categories of this paper are: gr-qc
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The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
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The categories of this paper are: hep-th
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The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
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The categories of this paper are: nucl-ex
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The categories of this paper are: econ
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The categories of this paper are: eess
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The categories of this paper are: acc-phys
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The categories of this paper are: math
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The categories of this paper are: atom-ph
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The categories of this paper are: nlin
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The categories of this paper are: math-ph
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The categories of this paper are: hep-ex