Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic properties of the Hubbard model on kagome stripes   We consider the one-orbital $N$-site repulsive Hubbard model on two
kagome-like chains, both of which yield a completely dispersionless (flat)
one-electron band. Using exact many-electron ground states in the subspaces
with $n\le n_{\max}$ ($n_{\max}\propto N$) electrons, we calculate the square
of the total spin in the ground state to discuss magnetic properties of the
models. We have found that although for $n<n_{\max}$ the ground states contain
fully polarized states, there is no finite region of electron densities
$n/{\cal{N}} <1$ (${\cal{N}}=N/3$ or ${\cal{N}}=N/5$) where ground-state
ferromagnetism survives for ${\cal{N}}\to\infty$.

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The categories of this paper are: hep-th
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The categories of this paper are: math-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-ex
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The categories of this paper are: nlin
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The categories of this paper are: hep-ex
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The categories of this paper are: q-fin
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The categories of this paper are: econ
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The categories of this paper are: hep-lat
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The categories of this paper are: q-bio
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The categories of this paper are: bayes-an
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The categories of this paper are: stat
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The categories of this paper are: patt-sol
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The categories of this paper are: mtrl-th