论文标题
拓扑角状态的自旋极化的遥控器
Remote control of spin polarization of topological corner states
论文作者
论文摘要
在二维高阶拓扑绝缘子中，角状态被不可忽略的距离分开。晶体对称性可以通过远程纠缠来保护其角状态的稳健性，这与时间反转破裂的扰动非常强大。在这里，我们通过在带有局部磁化和局部电势的菱形kekulé纳米结构中引入自由度的自由度来证明直接控制拓扑角状态的可能性。通过在一个角上施加局部磁化，另一个角也可以强烈旋转极化。通过进一步在同一角度应用局部电势，可以在两个角落逆转自旋极化的迹象。我们通过使用第一原理计算在一个角落以$γ$ - graphyne纳米结构的形式证明了材料实现。我们的研究提供了用于旋转和量子应用的高阶拓扑材料中量子状态远程相关性的展示。
In two-dimensional higher-order topological insulators, the corner states are separated by a non-negligible distance. The crystalline symmetries protect the robustness of their corner states with long-range entanglement, which are robust against time-reversal breaking perturbations. Here, we demonstrate the possibility of direct control of the topological corner states by introducing the spin degree of freedom in a rhombus-shaped Kekulé nanostructure with local magnetization and local electric potential. By applying a local magnetization on one corner, the other corner can also be strongly spin polarized. By further applying a local electric potential at the same corner, the sign of the spin polarization can be reversed at both corners. We demonstrate the material realization in a $γ$-graphyne nanostructure with Mn adsorption and Si replacement at one corner by using the first-principles calculations. Our studies give a showcase of the remote correlation of quantum states in higher-order topological materials for spintronic and quantum applications.
