Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Double-expansion impurity solver for multiorbital models with
  dynamically screened U and J   We present a continuous-time Monte Carlo impurity solver for multiorbital
impurity models which combines a strong-coupling hybridization expansion and a
weak-coupling expansion in the Hund's coupling parameter J. This
double-expansion approach allows to treat the dominant density-density
interactions U within the efficient segment representation. We test the
approach for a two-orbital model with static interactions, and then explain how
the double-expansion allows to simulate models with frequency dependent
U(\omega) and J(\omega). The method is used to investigate spin state
transitions in a toy model for fullerides, with repulsive bare J but attractive
screened J.

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The categories of this paper are: hep-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-th
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The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
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The categories of this paper are: quant-ph
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The categories of this paper are: cs
18
The categories of this paper are: econ
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The categories of this paper are: solv-int
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The categories of this paper are: patt-sol
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The categories of this paper are: alg-geom
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The categories of this paper are: supr-con
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The categories of this paper are: eess
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The categories of this paper are: hep-lat
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The categories of this paper are: ao-sci