Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optimal inhomogeneity for pairing in Hubbard systems with
  next-nearest-neighbor hopping   Previous studies have shown that bipartite Hubbard systems with inhomogeneous
hopping amplitudes can exhibit higher pair-binding energies than the uniform
model. Here we examine whether this result holds for systems with a more
generic band structure. To this end, we use exact diagonalization and the
density matrix renormalization group method to study the 4x4 Hubbard cluster
and the two-leg Hubbard ladder with checkerboard-modulated nearest-neighbor
hopping, t, and next-nearest-neighbor (diagonal) hopping, t_d. We find that the
strongest pairing continues to occur at an intermediate level of inhomogeneity.
While the maximal pair-binding energy is enhanced by a positive t_d/t, it is
suppressed and appears at weaker repulsion strengths and smaller hole
concentrations when t_d/t is negative. We point out a possible connection
between the pairing maximum and the magnetic properties of the system.

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The categories of this paper are: q-alg
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The categories of this paper are: nucl-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: adap-org
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The categories of this paper are: acc-phys
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The categories of this paper are: q-fin
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The categories of this paper are: econ
31
The categories of this paper are: ao-sci
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The categories of this paper are: math
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The categories of this paper are: hep-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: eess
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: nlin