What are spin currents in Heisenberg magnets?
介观与纳米尺度物理
2007-05-23 v2 强关联电子
摘要
We discuss the proper definition of the spin current operator in Heisenberg magnets subject to inhomogeneous magnetic fields. We argue that only the component of the naive "current operator" J_ij S_i x S_j in the plane spanned by the local order parameters <S_i> and <S_j> is related to real transport of magnetization. Within a mean field approximation or in the classical ground state the spin current therefore vanishes. Thus, finite spin currents are a direct manifestation of quantum correlations in the system.
引用
@article{arxiv.cond-mat/0405312,
title = {What are spin currents in Heisenberg magnets?},
author = {Florian Schuetz and Peter Kopietz and Marcus Kollar},
journal= {arXiv preprint arXiv:cond-mat/0405312},
year = {2007}
}
备注
4 pages, 1 figure, published version