Block-Lanczos density-matrix renormalization-group approach to spin transport in Heisenberg chains coupled to leads
arXiv:2001.02926 · doi:10.7566/JPSJ.89.044601
Abstract
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.
6 pages, 6 figures, final version
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