Spin textures and spin-wave excitations in doped Dirac-Weyl semimetals
Spin textures and spin-wave excitations in doped Dirac-Weyl semimetals
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DOI：
10.1103/physrevb.93.094438
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发表时间：
2016-03-31
影响因子：
3.7
通讯作者：
Nomura, Kentaro
中科院分区：
文献类型：
--
作者：
Araki, Yasufumi;Nomura, Kentaro
我们研究了三维狄拉克半金属中局域自旋的相关性和磁性织构。通过对费米子自由度积分，建立了磁矩的有效场论。自旋关联显示出很强的各向异性，起源于狄拉克电子的自旋动量锁定，除了传统的海森堡类铁磁关联。各向异性自旋相关允许拓扑非平凡的磁激发纹理，如瞬态刺猬状态，以及铁磁基态。铁磁外尔半金属中的自旋波色散也变得各向异性，垂直于磁化方向的色散较小。
We study correlations and magnetic textures of localized spins, doped in three-dimensional Dirac semimetals. An effective field theory for magnetic moments is constructed by integrating out the fermionic degrees of freedom. The spin correlation shows a strong anisotropy, originating from spin-momentum locking of Dirac electrons, in addition to the conventional Heisenberg-like ferromagnetic correlation. The anisotropic spin correlation allows topologically nontrivial magnetic excitation textures such as a transient hedgehog state, as well as the ferromagnetic ground state. The spin-wave dispersion in ferromagnetic Weyl semimetal also becomes anisotropic, being less dispersed perpendicular to the magnetization.