Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Block-Lanczos density-matrix renormalization-group approach to spin
  transport in Heisenberg chains coupled to leads   We adapt the block-Lanczos density-matrix renormalization-group technique to
study the spin transport in a spin chain coupled to two non-interacting
fermionic leads. As an example, we consider leads described by two-dimensional
tight-binding models on a square lattice. Although the simulations are carried
out using a chain representation of the leads, observables in the original
two-dimensional lattice can be calculated by reversing the block-Lanczos
transformation. This is demonstrated for leads with Rashba spin-orbit coupling.

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The categories of this paper are: hep-lat
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The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
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The categories of this paper are: dg-ga
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The categories of this paper are: math
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The categories of this paper are: gr-qc
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The categories of this paper are: astro-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: alg-geom
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ph
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The categories of this paper are: q-alg
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The categories of this paper are: patt-sol
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The categories of this paper are: bayes-an
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The categories of this paper are: plasm-ph