Hydrodynamics of Fermi arcs: Bulk flow and surface collective modes
Hydrodynamics of Fermi arcs: Bulk flow and surface collective modes
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DOI：
10.1103/physrevb.99.155120
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发表时间：
2018-12
影响因子：
3.7
通讯作者：
E. V. Gorbar;V. A. Miransky;I. Shovkovy;P. Sukhachov
中科院分区：
文献类型：
--
作者：
E. V. Gorbar;V. A. Miransky;I. Shovkovy;P. Sukhachov
提出了费米弧面面态的流体动力学描述。考虑到对杂质散射的强烈抑制，费米弧态的流体动力学状态在原则上应该是合理的。利用动力学理论，推导了费米弧流体动力学，研究了费米弧流体动力学对体流和表面集合模的影响。对于体流，所提出的费米弧流体动力学的关键是修改相应的边界条件。在平板几何结构中，根据表面和体相之间的转移速率，平板内电子流体的流体动力学流动在表面附近可以显著地改变甚至增强。关于表面集体模谱，与前人的研究结果一致，发现费米弧使动量空间中的表面等离子体激元色散关系具有额外的无间隙谱分支和较强的各向异性。在动量空间中，有缝模的特征是频率恒定的闭合椭圆轮廓线。
The hydrodynamic description of the Fermi arc surface states is proposed. In view of the strong suppression of scattering on impurities, the hydrodynamic regime for Fermi arc states should be, in principle, plausible. By using the kinetic theory, the Fermi arc hydrodynamics is derived and the corresponding effects on the bulk flow and surface collective modes are studied. For the bulk flow, the key effect of the proposed Fermi arc hydrodynamics is the modification of the corresponding boundary conditions. In a slab geometry, it is shown that, depending on the transfer rates between the surface and bulk, the hydrodynamic flow of the electron fluid inside the slab could be significantly altered and even enhanced near the surfaces. As to the spectrum of the surface collective modes, in agreement with earlier studies, it is found that the Fermi arcs allow for an additional gapless spectrum branch and a strong anisotropy of the surface plasmon dispersion relations in momentum space. The gapped modes are characterized by closed elliptic contours of constant frequency in momentum space.