论文标题
没有外部磁场的Weyl轨道
Weyl orbits without an external magnetic field
论文作者
论文摘要
磁场中的Weyl半法子产生了有趣的非本地电子轨道：手性Landau水平通过散装的弹道传输与沿Lorentz力驱动的表面费米-Arc滑动的动量空间相结合。散装手性兰道水平也可以由轴向磁场诱导，轴向磁场取决于Weyl点的手性。但是，仅在Weyl点周围的低能扇区中，可以描述引起它们的显微扰动。另外，由于伪场是固有的，因此没有明显的理由沿Fermi-arcs滑动的洛伦兹力。因此，仅由伪场驱动的非本地轨道的存在并不明显。在这里，我们表明，对于在整体光谱中至少有四个Weyl点的系统，仅轴向场就可以诱导非本地轨道。我们通过分析半古典理论，波包动力学的微观数值研究和表面绿色的功能分析来讨论潜在的机制。
Weyl semimetals in a magnetic field give rise to interesting non-local electronic orbits: the ballistic transport through the bulk enabled by the chiral Landau levels is combined with a momentum-space sliding along the surface Fermi-arc driven by the Lorentz force. Bulk chiral Landau levels can also be induced by axial fields whose sign depends on the chirality of the Weyl point. However, the microscopic perturbations that give rise to them can be described in terms of gauge fields only in the low-energy sectors around the Weyl points. In addition, since pseudo-fields are intrinsic, there is no apparent reason for a Lorentz force that causes sliding along the Fermi-arcs. Therefore, the existence of non-local orbits driven exclusively by pseudo-fields is not obvious. Here, we show that for systems with at least four Weyl points in the bulk spectrum, non-local orbits can be induced by axial fields alone. We discuss the underlying mechanisms by a combination of analytical semi-classical theory, the microscopic numerical study of wave-packet dynamics, and a surface Green's function analysis.
