Dynamical magnetoelectric coupling in helical magnets
Dynamical magnetoelectric coupling in helical magnets
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DOI：
10.1103/physrevlett.98.027203
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发表时间：
2007-01-12
影响因子：
8.6
通讯作者：
Nagaosa, Naoto
中科院分区：
文献类型：
--
作者：
Katsura, Hosho;Balatsky, Alexander V.;Nagaosa, Naoto
我们通过自旋轨道相互作用建立了螺旋磁体与电极化耦合的集体模式动力学理论。与铁电性相关的低洼模式不是横向光学声子，而是与电极化杂化的自旋波。这种杂化导致在零磁各向异性极限下的类德鲁德介电函数epsilon（omega）。另外还有两种低洼模式：螺旋的相位模式和螺旋平面沿偏振轴的旋转模式。揭示了这些低洼模式在中子散射和反铁磁共振中的作用，并讨论了一种检测动态磁电耦合的新实验。
We develop a theory of collective mode dynamics in the helical magnets coupled to electric polarization via spin-orbit interaction. The low-lying modes associated with the ferroelectricity are not the transverse optical phonons, but are the spin waves hybridized with the electric polarization. This hybridization leads to the Drude-like dielectric function epsilon(omega) in the limit of zero magnetic anisotropy. There are two additional low-lying modes: phason of the spiral and rotation of helical plane along the polarization axis. Role of these low-lying modes in the neutron scattering and antiferromagnetic resonance is revealed, and a novel experiment to detect the dynamical magnetoelectric coupling is discussed.