Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Symmetry breaking and restoration using the equation-of-motion technique
  for nonequilibrium quantum impurity models   The description of the dynamics of correlated electrons in quantum impurity
models is typically described within the nonequilibrium Green function
formalism combined with a suitable approximation. One common approach is based
on the equation-of-motion technique often used to describe different regimes of
the dynamic response. Here, we show that this approach may violate certain
symmetry relations that must be fulfilled by the definition of the Green
functions. These broken symmetries can lead to unphysical behavior. To
circumvent this pathological shortcoming of the equation-of-motion approach we
provide a scheme to restore basic symmetry relations. Illustrations are given
for the Anderson and double Anderson impurity models.

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The categories of this paper are: quant-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: adap-org
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The categories of this paper are: cs
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The categories of this paper are: math-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-alg
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-ex
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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: alg-geom
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The categories of this paper are: eess
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The categories of this paper are: hep-lat