期刊
ANNALS OF PHYSICS
卷 333, 期 -, 页码 221-271出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.aop.2013.03.006
关键词
Non-equilibrium magnetism; Multi-band Hubbard model; Exchange interaction; Non-equilibrium Green function; Strongly correlated system
资金
- European Union ERC [281043]
- [SFB925]
We formulate a low-energy theory for the magnetic interactions between electrons in the multi-band Hubbard model under non-equilibrium conditions determined by an external time-dependent electric field which simulates laser-induced spin dynamics. We derive expressions for dynamical exchange parameters in terms of non-equilibrium electronic Green functions and self-energis, which can be computed, e.g., with the methods of time-dependent dynamical mean-field theory. Moreover, we find that a correct description of the system requires, in addition to exchange, a new kind of magnetic interaction, that we name twist exchange, which formally resembles Dzyaloshinskii-Moriya coupling, but is not due to spin orbit, and is actually due to an effective three-spin interaction. Our theory allows the evaluation of the related time-dependent parameters as well. (C) 2013 Published by Elsevier Inc.
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