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Nonequilibrium itinerant-electron magnetism: A time-dependent mean-field theory

机译:非平衡流动电子磁:时间相关的平均场理论

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摘要

We study the dynamical magnetic susceptibility of a strongly correlated electronic system in the presence of a time-dependent hopping field, deriving a generalized Bethe-Salpeter equation that is valid also out of equilibrium. Focusing on the single-orbital Hubbard model within the time-dependent Hartree-Fock approximation, we solve the equation in the nonequilibrium adiabatic regime, obtaining a closed expression for the transverse magnetic susceptibility. From this, we provide a rigorous definition of nonequilibrium (time-dependent) magnon frequencies and exchange parameters, expressed in terms of nonequilibrium single-electron Green's functions and self-energies. In the particular case of equilibrium, we recover previously known results.
机译:我们研究了存在时间依赖的跳变场的情况下强相关电子系统的动态磁化率,推导了一个有效的,不平衡的,广义的Bethe-Salpeter方程。着眼于与时间有关的Hartree-Fock近似中的单轨道Hubbard模型,我们在非平衡绝热状态下求解方程,获得横向磁化率的封闭表达式。由此,我们以非平衡单电子格林函数和自能量表示了严格的非平衡(随时间变化)的磁振子频率和交换参数的定义。在平衡的特定情况下,我们恢复了先前已知的结果。

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  • 来源
    《Physical review》 |2016年第8期|085153.1-085153.11|共11页
  • 作者单位

    Institute for Molecules and Materials, Radboud University Nijmegen, 6525 AJ Nijmegen, The Netherlands,Istituto Italiano di Tecnologia, 16163 Genova, Italy;

    Institut fuer Theoretische Physik, Universitat Hamburg, Jungiusstrasse 9, D-20355 Hamburg, Germany;

    Institute for Molecules and Materials, Radboud University Nijmegen, 6525 AJ Nijmegen, The Netherlands;

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