Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Precursors of the insulating state in the square lattice Hubbard model   We study the two-dimensional square lattice Hubbard model for small to
moderate interaction strengths $1\leq U/t\leq 4$ by means of the ladder dual
fermion approach. The non-local correlations beyond dynamical mean-field theory
lower the potential energy, lead to a maximum in the uniform susceptibility and
induce a pseudogap in the density of states. While the self-energy exhibits
precursors of a possible insulating phase linked to the appearance of
long-range fluctuations, the metallic phase persists within the accessible
temperature range. Finite-size effects affect results qualitatively. Upper
bounds on the crossover temperature are found to be significantly lower than
previously reported dynamical vertex approximation results at $U/t=1$.

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The categories of this paper are: hep-lat
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The categories of this paper are: astro-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: math-ph
3
The categories of this paper are: physics
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The categories of this paper are: quant-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: math
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The categories of this paper are: dg-ga
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The categories of this paper are: mtrl-th
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The categories of this paper are: solv-int
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The categories of this paper are: eess