Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quench dynamics of Anderson impurity model using configuration
  interaction method   We study the quench dynamics of an Anderson impurity model using the
configuration interaction (CI) method. In particular, we focus on the
relaxation behavior of the impurity occupation. The system is found to behave
very differently in the weak-coupling and strong-coupling regimes. In the
weak-coupling regime, the impurity occupation relaxes to a time-independent
constant quickly after only a few oscillations. In the strong-coupling regime,
the impurity occupation develops a fast oscillation, with a much slower
relaxation. We show that it is the multi-peak structure in the many-body energy
spectrum that separates these two regimes. The characteristic behavior,
including the power-law decay and the period of oscillation, can also be
related to certain features in the many-body energy spectrum. The respective
advantages of several impurity solvers are discussed, and the convergence of
different CI truncation schemes is provided.

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The categories of this paper are: eess
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The categories of this paper are: nlin
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The categories of this paper are: econ
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The categories of this paper are: nucl-th
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The categories of this paper are: solv-int
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The categories of this paper are: gr-qc
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The categories of this paper are: adap-org
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The categories of this paper are: physics
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The categories of this paper are: atom-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: math-ph
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The categories of this paper are: stat
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-lat