Collective excitations in Weyl semimetals in the hydrodynamic regime
Collective excitations in Weyl semimetals in the hydrodynamic regime
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DOI：
10.1088/1361-648x/aac500
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发表时间：
2018-02
期刊：
影响因子：
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通讯作者：
P. Sukhachov;E. V. Gorbar;I. Shovkovy;V. A. Miransky
中科院分区：
文献类型：
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作者：
P. Sukhachov;E. V. Gorbar;I. Shovkovy;V. A. Miransky
用一致流体力学方法研究了Weyl材料的集体激发光谱。相应的框架包括涡旋和手征反常效应，以及对能量b0和动量的Weyl节点之间的分离的依赖。后者是通过Chern-Simons对麦克斯韦方程中电流和电荷密度的贡献而引入的。研究发现，即使在没有背景磁场的情况下，某些集体激发(如类螺旋子模和反常霍尔波)也会受到手征位移的强烈影响。在背景磁场中，预言了具有线性色散关系的独特的纵向和横向反常霍尔波的存在。它们起源于电荷密度和电磁场的振荡，其中场的不同分量通过Weyl半金属中的反常霍尔效应联系在一起。
The spectrum of collective excitations in Weyl materials is studied by using consistent hydrodynamics. The corresponding framework includes the vortical and chiral anomaly effects, as well as the dependence on the separations between the Weyl nodes in energy b0 and momentum . The latter are introduced via the Chern–Simons contributions to the electric current and charge densities in Maxwell’s equations. It is found that, even in the absence of a background magnetic field, certain collective excitations (e.g. the helicon-like modes and the anomalous Hall waves) are strongly affected by the chiral shift . In a background magnetic field, the existence of the distinctive longitudinal and transverse anomalous Hall waves with a linear dispersion relation is predicted. They originate from the oscillations of the electric charge density and electromagnetic fields, in which different components of the fields are connected via the anomalous Hall effect in Weyl semimetals.