论文标题
费米弧的动力密度和自旋响应及其对Weyl Semimetals的后果
Dynamical density and spin response of Fermi arcs and their consequences for Weyl semimetals
论文作者
论文摘要
Weyl半法具有异国情调的Fermi-arc表面状态，这强烈影响其电磁特性。我们通过在拓扑绝缘状态下闭合带隙并引入时间反向超对称性的术语来得出复合密度旋转响应张量的所有组件的分析表达式。根据结果，我们讨论了电磁敏感性，当前响应以及由密度旋转响应引起的其他物理效应。我们发现仅由费米弧引起的磁电效应。我们还讨论了在随机相近似中电子电子相互作用的影响，并研究了Fermi-Arc状态形成的表面等离子体的分散。我们的工作对于理解费米弧的电磁和光学特性很有用。
Weyl semimetals exhibit exotic Fermi-arc surface states, which strongly affect their electromagnetic properties. We derive analytical expressions for all components of the composite density-spin response tensor for the surfaces states of a Weyl-semimetal model obtained by closing the band gap in a topological insulating state and introducing a time-reversal-symmetry-breaking term. Based on the results, we discuss the electromagnetic susceptibilities, the current response, and other physical effects arising from the density-spin response. We find a magnetoelectric effect caused solely by the Fermi arcs. We also discuss the effect of electron-electron interactions within the random phase approximation and investigate the dispersion of surface plasmons formed by Fermi-arc states. Our work is useful for understanding the electromagnetic and optical properties of the Fermi arcs.
