论文标题
拓扑结构绝缘子中的阴影表面状态
Shadow surface states in topological Kondo insulators
论文作者
论文摘要
当将化学势调谐到狄拉克点时，通常，3D拓扑绝缘子的表面状态具有可忽略的量子振荡。相比之下，我们发现，当将化学势固定在狄拉克点时，拓扑结膜绝缘子可以用任意大的费米表面支撑表面状态。我们说明这些费米表面会产生有限的频率量子振荡，这可以与未脑的散装带的极端区域相提并论。我们表明，当晶体对称性在最小的两轨模型中从立方体到四方降低时，就会发生这种情况。我们将这样的表面模式标记为“阴影表面状态”。此外，我们表明，对于四方拓扑界面绝缘体，可以自稳定地稳定导致阴影表面状态的足够的下一邻居隔开杂交。因此，阴影表面状态为高频量子振荡提供了一个重要的例子，超出了立方拓扑结束剂的背景。
The surface states of 3D topological insulators in general have negligible quantum oscillations when the chemical potential is tuned to the Dirac points. In contrast, we find that topological Kondo insulators can support surface states with an arbitrarily large Fermi surface when the chemical potential is pinned to the Dirac point. We illustrate that these Fermi surfaces give rise to finite-frequency quantum oscillations, which can become comparable to the extremal area of the unhybridized bulk bands. We show that this occurs when the crystal symmetry is lowered from cubic to tetragonal in a minimal two-orbital model. We label such surface modes as `shadow surface states'. Moreover, we show that the sufficient next-nearest neighbor out-of-plane hybridization leading to shadow surface states can be self-consistently stabilized for tetragonal topological Kondo insulators. Consequently, shadow surface states provide an important example of high-frequency quantum oscillations beyond the context of cubic topological Kondo insulators.
