Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Loop Current and Antiferromagnetic States in Fermionic Hubbard Model
  with Staggered Flux at Half Filling   Anticipating realization of interacting fermions in an optical lattice with a
large gauge field, we consider phase transitions and loop currents in a
two-dimensional S=1/2 fermionic-Hubbard model with $\pi$/2-staggered flux at
half filling. We use a variational Monte Carlo method, which is reliable even
for strong correlations. As a trial wave function, a coexistent state of
antifferomagnetic and staggered-flux orders is studied. In a strongly
correlated regime, the ground state becomes an insulating coexistent state with
loop currents. By comparing fermions with bosons, we discuss an important role
of Pauli principle.

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The categories of this paper are: plasm-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: adap-org
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The categories of this paper are: hep-ex
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The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
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The categories of this paper are: chem-ph
3
The categories of this paper are: physics
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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: hep-th
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The categories of this paper are: nucl-th
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The categories of this paper are: nlin
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The categories of this paper are: acc-phys
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The categories of this paper are: econ
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The categories of this paper are: dg-ga