Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin polarization in the Hubbard model with Rashba spin-orbit coupling
  on a ladder   The competition between on-site Coulomb repulsion and Rashba spin-orbit
coupling (RSOC) is studied on two-leg ladders by numerical techniques. By
studying persistent currents in closed rings by exact diagonalization, it is
found that the contribution to the current due to the RSOC V_{SO}, for a fixed
value of the Hubbard repulsion U reaches a maximum at intermediate values of
V_{SO}. By increasing the repulsive Hubbard coupling U, this spin-flipping
current is suppressed and eventually it becomes opposite to the spin-conserving
current. The main result is that the spin accumulation defined as the relative
spin polarization between the two legs of the ladder is enhanced by U. Similar
results for this Hubbard-Rashba model are observed for a completely different
setup in which two halves of the ladders are connected to a voltage bias and
the ensuing time-dependent regime is studied by the density
matrix-renormalization group technique. It is also interesting a combined
effect between V_{SO} and U leading to a strong enhancement of
antiferromagnetic order which in turn may explain the observed behavior of the
spin-flipping current. The implications of this enhancement of the spin-Hall
effect with electron correlations for spintronic devices is discussed.

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The categories of this paper are: adap-org
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The categories of this paper are: supr-con
1
The categories of this paper are: cs
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The categories of this paper are: stat
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The categories of this paper are: hep-ex
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The categories of this paper are: quant-ph
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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: comp-gas
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The categories of this paper are: q-fin
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The categories of this paper are: solv-int
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The categories of this paper are: eess
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-ph
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The categories of this paper are: physics
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The categories of this paper are: ao-sci